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Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Long Duration Contracts [Abstract] |  |
Beginning balance | $ 5,940 |
Deferred policy acquisition costs | 6,112 | $ 5,607
Ending balance | 6,112 | 5,607
Allstate Health and Benefits |  |
Long Duration Contracts [Abstract] |  |
Beginning balance | 511 | 502
Acquisition costs deferred | 87 | 45
Amortization charged to income | (57) | (30)
Experience adjustment | (11) | (14)
Deferred policy acquisition costs | 530 | 503
Short-duration contracts | 32 | 27
Ending balance | 530 | 503
Accident and health insurance |  |
Long Duration Contracts [Abstract] |  |
Beginning balance | 321 | 322
Acquisition costs deferred | 51 | 25
Amortization charged to income | (40) | (16)
Experience adjustment | (9) | (13)
Deferred policy acquisition costs | 323 | 318
Ending balance | 323 | 318
Traditional life |  |
Long Duration Contracts [Abstract] |  |
Beginning balance | 90 | 79
Acquisition costs deferred | 27 | 13
Amortization charged to income | (10) | (7)
Experience adjustment | (1) | 0
Deferred policy acquisition costs | 106 | 85
Ending balance | 106 | 85
Interest-sensitive life insurance |  |
Long Duration Contracts [Abstract] |  |
Beginning balance | 100 | 101
Acquisition costs deferred | 9 | 7
Amortization charged to income | (7) | (7)
Experience adjustment | (1) | (1)
Deferred policy acquisition costs | 101 | 100
Ending balance | 101 | 100
Allstate Protection |  |
Long Duration Contracts [Abstract] |  |
Deferred policy acquisition costs | 2,478 | 2,203
Ending balance | 2,478 | 2,203
Protection Services |  |
Long Duration Contracts [Abstract] |  |
Deferred policy acquisition costs | 3,072 | 2,874
Ending balance | $ 3,072 | $ 2,874

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- Definition Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Short-duration Contracts + 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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