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Insurance Liabilities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 20, 2017
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Contractual deductible recoverable amount | $ 12,100 | $ 12,100 |  |
Collateral held for deductible recoverable amounts | 8,600 | 8,700 |  |
Liability for unpaid losses and loss adjustment expenses, allowance for credit losses | 14 | 14 |  |
Unfavorable (favorable) prior year loss reserve development | 254 | (392) | $ (530) |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | 254 |  |  |
Net loss reserve discount | $ 1,175 | 1,233 |  |
Tabular discount rate (as a percent) | 45.00% |  |  |
Workers compensation tabular discount amount | $ 107 | 294 |  |
Workers compensation non tabular discount amount | 1,100 | 939 |  |
Net loss reserve discount charge | $ 226 | 195 | (703) |
New York |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Nontabular discount rate (as a percent) | 5.00% |  |  |
DELAWARE |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Nontabular discount rate (as a percent) | 4.50% |  |  |
DELAWARE | Lexington Insurance Company |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Nontabular discount rate (as a percent) | 4.50% |  |  |
PENNSYLVANIA | National Union Fire Insurance Company |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Nontabular discount rate (as a percent) | 4.50% |  |  |
NICO |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Amortization of deferred gain on retroactive reinsurance | $ 322 | 48 | 189 |
U.S. Workers' Compensation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | (273) | (267) | (644) |
U.S. Excess Casualty |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | 545 | (32) | (116) |
U.S. Other Casualty |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | 12 | (133) | (149) |
U.S. Financial Lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | 51 | 94 | 939 |
U.S. Property and Special Risks |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | (44) | (10) | (81) |
U.S. Personal Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | (23) | (64) |  |
UK/Europe Casualty and Financial lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | 170 | 165 | 82 |
UK/Europe Property and Special Risks |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | (35) | 81 | (153) |
UK/Europe and Japan Personal Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | (47) | $ (57) | $ (111) |
U.S. Run-Off Long Tail Insurance Lines | NICO | Accident Years 2015 and Prior |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Risk Transferred - U.S. Commercial long-tail exposures for accident years 2015 and prior (as a percent) |  |  |  | 80.00%
Businesses in run-off |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | 196 |  |  |
Businesses in run-off | Asbestos Loss Portfolio Transfer |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | 85 |  |  |
Businesses in run-off | Blackboard |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Unfavorable (favorable) prior year development, net of external reinsurance, before ADC cessions | $ 112 |  |  |

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