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Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized gains (losses) $ 3 $ 67
Provision for credit losses 0 (6)
Income (loss) before income taxes and income (loss) from operating affiliates 678 1,166
Income tax (expense) benefit (121) (101)
Net of tax 574 1,120
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) (63) (28)
Provision for credit losses 0 (6)
Income (loss) before income taxes and income (loss) from operating affiliates (63) (34)
Income tax (expense) benefit 11 5
Net of tax $ (52) $ (29)