Entity tax identification number Entity Tax Identification Number Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Total Fully Corrected Under VFCP and PTE 2002-51 EBP, Schedule of Delinquent Participant Contribution, Corrected Adjustment from fair value to contract value for interest in fully benefit-responsive contracts EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Fair Value Adjustment to Contract Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Fair Value Adjustment to Contract Value EBP, Other Investment EBP, Other Investment [Member] EBP, Employer Matching Contribution, Next Four Percent EBP, Employer Matching Contribution, Next Four Percent [Member] EBP, Employer Matching Contribution, Next Four Percent Selling price EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] Self-directed brokerage accounts EBP, Self-Directed Brokerage Account [Member] General-purpose loan, maximum borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value of Assets and Liabilities EBP, Investment, Fair Value and NAV [Text Block] Minimum borrowing amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Administrative expense EBP, Accrued Expense EBP, Fully Benefit-Responsive Investment Contract [Abstract] EBP 001 EBP 001 [Member] EBP 001 Investments—at fair value (Note 6) Total assets at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Participant contributions corrected, related earnings excluded EBP, Schedule of Delinquent Participant Contribution, Corrected, Earnings Excluded EBP, Schedule of Delinquent Participant Contribution, Corrected, Earnings Excluded Level 1 Fair Value, Inputs, Level 1 [Member] Fully Benefit-Responsive Investment Contracts EBP, Fully Benefit-Responsive Investment Contract [Text Block] EBP, Investment, Fair Value and NAV [Abstract] Balance limit EBP, Involuntary Cash-out Limit EBP, Involuntary Cash-out Limit EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] Total assets EBP, Asset Assets EBP, Asset [Abstract] Primary residence, minimum borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Minimum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Minimum Borrowing Term EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type [Axis] EBP, Employer Contribution, Type Statistical Measurement [Axis] Statistical Measurement [Axis] Additions EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Benefits Paid to Participants and Participant Notes Receivable EBP, Payment to Participant [Policy Text Block] Plan transfers EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Total liabilities EBP, Liability Amendment Flag Amendment Flag Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Investments [Domain] Investments [Domain] EBP, Schedule of Delinquent Participant Contribution [Abstract] Use of Estimates EBP, Use of Estimate [Policy Text Block] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Employer match EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Schedule of Delinquent Participant Contribution [Line Items] InfoArmor Retirement Plan EBP, InfoArmor Retirement Plan [Member] EBP, InfoArmor Retirement Plan Minimum Minimum [Member] Dividends and interest EBP, Investment Income, Receivable Investment Type [Axis] Investment Type [Axis] Interest income on participant notes receivable EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Contribution vesting service period EBP, Employer Contribution Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of Plan EBP, Description of Plan [Text Block] Contributions Pending Correction in VFCP EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Merged Plans [Axis] EBP, Merged Plans [Axis] EBP, Merged Plans EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Interest EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment Automatic deferral rate, annual increase EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold. The Allstate Corporation common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Net investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expense EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Total EBP, Asset Held for Investment Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Collective short term investment fund EBP, Collective Short-Term Investment Fund [Member] EBP, Collective Short-Term Investment Fund EBP, Merged Plans [Domain] EBP, Merged Plans [Domain] EBP, Merged Plans [Domain] Realized gain EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Realized Gain (Loss) on Investment Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Fully Benefit-Responsive Investment Contract [Line Items] Contributions Corrected Outside VFCP EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase, before transfers EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Related-Party Transactions and Party-In-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] SquareTrade, Inc. 401)k) Plan EBP, SquareTrade, Inc. 401)k) Plan [Member] EBP, SquareTrade, Inc. 401)k) Plan EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] Primary residence, maximum borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Administrative Expenses EBP, Expense [Policy Text Block] Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage Participant loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type EBP, Employer Matching Contribution, First Two Percent EBP, Employer Matching Contribution, First Two Percent [Member] EBP, Employer Matching Contribution, First Two Percent Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Contribution vesting percentage EBP, Employer Contribution Vesting Percentage Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age Net increase, after transfers Net EBP, Change in Net Asset Available for Benefit After Transfer, Increase (Decrease) Net EBP, Change in Net Asset Available for Benefit After Transfer, Increase (Decrease) Participant loans, interest rates EBP, Asset Held for Investment, Participant Loan, Interest Rate General-purpose loan, minimum borrowing term EBP, Note Receivable From Participant, General Loan, Minimum Borrowing Term EBP, Note Receivable From Participant, General Loan, Minimum Borrowing Term Common Collective Trust Fund Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Deductions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Participant notes receivable EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Cost of shares purchased EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost EBP, Subsequent Event [Abstract] Liabilities EBP, Liability [Abstract] Subsequent Events EBP, Subsequent Event [Text Block] Minimum crediting rate EBP, Fully Benefit-Responsive Investment Contract, Minimum Crediting Rate EBP, Fully Benefit-Responsive Investment Contract, Minimum Crediting Rate Schedule H, Line 4a - Schedule of Delinquent Participant Contributions EBP, Schedule of Delinquent Participant Contribution [Text Block] EBP, Schedule of Delinquent Participant Contribution [Table] EBP, Schedule of Delinquent Participant Contribution [Table] Basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Tax Status EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Contributions Not Corrected EBP, Schedule of Delinquent Participant Contribution, Not Corrected Withdrawal age EBP, Withdrawal Age EBP, Withdrawal Age Net assets available for benefits Beginning of year End of year EBP, Net Asset Available for Benefit Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Investments—at contract value (Note 5) EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Matching percentage EBP, Employer Contribution, Matching Percentage Number of days to change contribution rate EBP, Participant Contribution, Number Of Days To Change Contribution Rate EBP, Participant Contribution, Number Of Days To Change Contribution Rate Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]