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Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized gains (losses) $ 210 $ 169 $ 442 $ 358
Provision for credit losses 4 6 (4) 4
Income (loss) before income taxes and income (loss) from operating affiliates 1,503 1,050 3,592 3,537
Income tax (expense) benefit (215) (98) (550) (296)
Net of tax 1,350 988 3,161 3,377
Reclassification out of accumulated other comprehensive income | Unrealized appreciation (decline) on available-for-sale investments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized gains (losses) 44 54 (5) (38)
Provision for credit losses 4 6 (4) 4
Income (loss) before income taxes and income (loss) from operating affiliates 48 60 (9) (34)
Income tax (expense) benefit (7) 0 5 12
Net of tax $ 41 $ 60 $ (4) $ (22)