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Insurance Liabilities - Reconciliation of Net Prior Year Development (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | $ 254 |  |
Prior Year Development Net of External Reinsurance After ADC Cessions | (120) |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | (136) |  |
Prior Year Development After Amortization and Re-attribution | (256) |  |
Total, prior years, excluding discount and amortization of deferred gain | 254 |  |
Asbestos Loss Portfolio Transfer |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior year development ceded | 85 |  |
Adverse Development Reinsurance |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior year development ceded | 289 |  |
U.S. Workers' Compensation (before discount) |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | (273) | $ (267) | $ (644)
Prior Year Development Net of External Reinsurance After ADC Cessions | (205) |  |
Re-Attribution of ADC Recovery | (14) |  |
Amortization of Deferred Gain at Inception | (42) |  |
Prior Year Development After Amortization and Re-attribution | (261) |  |
Total, prior years, excluding discount and amortization of deferred gain | (273) |  |
U.S. Excess Casualty |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | 545 | (32) | (116)
Prior Year Development Net of External Reinsurance After ADC Cessions | 238 |  |
Re-Attribution of ADC Recovery | 22 |  |
Amortization of Deferred Gain at Inception | (32) |  |
Prior Year Development After Amortization and Re-attribution | 228 |  |
Total, prior years, excluding discount and amortization of deferred gain | 545 |  |
U.S. Other Casualty |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | 12 | (133) | (149)
Prior Year Development Net of External Reinsurance After ADC Cessions | 44 |  |
Re-Attribution of ADC Recovery | (38) |  |
Amortization of Deferred Gain at Inception | (31) |  |
Prior Year Development After Amortization and Re-attribution | (25) |  |
Total, prior years, excluding discount and amortization of deferred gain | 12 |  |
U.S. Financial Lines |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | 51 | 94 | 939
Prior Year Development Net of External Reinsurance After ADC Cessions | (40) |  |
Re-Attribution of ADC Recovery | 20 |  |
Amortization of Deferred Gain at Inception | (23) |  |
Prior Year Development After Amortization and Re-attribution | (43) |  |
Total, prior years, excluding discount and amortization of deferred gain | 51 |  |
U.S. Property and Special Risks |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | (44) | (10) | (81)
Prior Year Development Net of External Reinsurance After ADC Cessions | 4 |  |
Re-Attribution of ADC Recovery | 11 |  |
Amortization of Deferred Gain at Inception | (7) |  |
Prior Year Development After Amortization and Re-attribution | 8 |  |
Total, prior years, excluding discount and amortization of deferred gain | (44) |  |
U.S. Personal Insurance |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | (23) | (64) |
Prior Year Development Net of External Reinsurance After ADC Cessions | (25) |  |
Re-Attribution of ADC Recovery | (1) |  |
Amortization of Deferred Gain at Inception | (1) |  |
Prior Year Development After Amortization and Re-attribution | (27) |  |
Total, prior years, excluding discount and amortization of deferred gain | (23) |  |
UK/Europe Casualty and Financial lines |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | 170 | 165 | 82
Prior Year Development Net of External Reinsurance After ADC Cessions | 170 |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | 0 |  |
Prior Year Development After Amortization and Re-attribution | 170 |  |
Total, prior years, excluding discount and amortization of deferred gain | 170 |  |
UK/Europe Property and Special Risks |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | (35) | 81 | (153)
Prior Year Development Net of External Reinsurance After ADC Cessions | (35) |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | 0 |  |
Prior Year Development After Amortization and Re-attribution | (35) |  |
Total, prior years, excluding discount and amortization of deferred gain | (35) |  |
UK/Europe and Japan Personal Insurance |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | (47) | (57) | (111)
Prior Year Development Net of External Reinsurance After ADC Cessions | (47) |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | 0 |  |
Prior Year Development After Amortization and Re-attribution | (47) |  |
Total, prior years, excluding discount and amortization of deferred gain | (47) |  |
Other Operations |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | 1 |  |
Prior Year Development Net of External Reinsurance After ADC Cessions | 1 |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | 0 |  |
Prior Year Development After Amortization and Re-attribution | 1 |  |
Other product lines |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | (299) | $ (162) | $ (264)
Prior Year Development Net of External Reinsurance After ADC Cessions | (336) |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | 0 |  |
Prior Year Development After Amortization and Re-attribution | (336) |  |
Subtotal, adjusted pre-tax basis |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | 58 |  |
Prior Year Development Net of External Reinsurance After ADC Cessions | (231) |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | (136) |  |
Prior Year Development After Amortization and Re-attribution | (367) |  |
Businesses in run-off |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | 196 |  |
Prior Year Development Net of External Reinsurance After ADC Cessions | 111 |  |
Re-Attribution of ADC Recovery | 0 |  |
Amortization of Deferred Gain at Inception | 0 |  |
Prior Year Development After Amortization and Re-attribution | 111 |  |
Businesses in run-off | Asbestos Loss Portfolio Transfer |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Prior Year Development Net of External Reinsurance Before ADC Cessions | $ 85 |  |

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