v3.26.1
Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized gains (losses) $ (17) $ 229 $ (104) $ 232
Provision for credit losses (4) (8) 1 (8)
Income (loss) before income taxes and income (loss) from operating affiliates 1,175 1,411 2,284 2,089
Income tax (expense) benefit (164) (214) (262) (335)
Net of tax 1,057 1,237 2,104 1,811
Reclassification out of accumulated other comprehensive income | Unrealized appreciation (decline) in value of available-for-sale securities, net of deferred income tax        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized gains (losses) (48) 14 (31) (49)
Provision for credit losses (4) (8) 1 (8)
Income (loss) before income taxes and income (loss) from operating affiliates (52) 6 (30) (57)
Income tax (expense) benefit 10 1 6 12
Net of tax $ (42) $ 7 $ (24) $ (45)