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Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Variable Interest Entity [Line Items] |  |
Net gains (losses) on investments and derivatives | $ (349) | $ (164)
Interests in surplus notes (in percent) | 100.00% |
Skyland |  |
Variable Interest Entity [Line Items] |  |
Quota share (as a percent) | 100.00% |
Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Net gains (losses) on investments and derivatives | $ (67) | (123)
Management fee | 0 | 10
Variable Interest Entity, Primary Beneficiary | Allstate Protection |  |
Variable Interest Entity [Line Items] |  |
Insurance premiums and contract charges | 1 | 61
Costs and expenses | 2 | 87
Variable Interest Entity, Primary Beneficiary | Consolidation, Eliminations |  |
Variable Interest Entity [Line Items] |  |
Ceded losses incurred | $ 1 | $ 12

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- Definition Reinsurance Agreement, Quota Share Percentage + References No definition available. + Details
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- Definition Surplus Notes, Noncontrolling Interest, Percentage To Absorb Expected Losses + References No definition available. + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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