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Summary of Significant Accounting Policies - Schedule of Deferred Policy Acquisition Costs Activity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |
Beginning balance | $ 5,773 | $ 5,940 | $ 5,442
Acquisition costs deferred | 8,784 | 8,393 | 7,776
Amortization charged to income | (8,384) | (8,022) | (7,246)
Experience adjustment | (5) | (17) | (32)
Reclassified to assets held for sale | (5) | (521) | 0
Ending balance | 6,163 | 5,773 | 5,940
Allstate Protection |  |  |
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |
Beginning balance |  | 2,378 |
Ending balance |  |  | 2,378
Protection Services |  |  |
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |
Beginning balance |  | 3,022 |
Ending balance |  |  | 3,022
Allstate Health and Benefits |  |  |
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |
Beginning balance |  | 497 |
Ending balance | 0 |  | 497
All other |  |  |
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |
Beginning balance | 63 | 43 |
Ending balance | $ 86 | $ 63 | $ 43

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- Definition Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Reclassified to Held For Sale + References No definition available. + Details
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- Definition Amount of expense for writeoff from unexpected insurance contract termination, charged against previously capitalized amount in deferred policy acquisition cost and present value of future profit from insurance contract acquired in business combination. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479432/944-30-50-2B + Details
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- Definition Amount of addition in deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479432/944-30-50-2B + Details
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- Definition Amount, after accumulated amortization, of deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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