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Other Comprehensive Income - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Provision for credit losses $ 3 $ (44) $ (1)
Income (loss) before income taxes 3,570 1,562 2,368
Income tax (expense) benefit 873 (80) (128)
Net of tax 4,443 1,476 2,157
Reclassification out of accumulated other comprehensive income | Unrealized Appreciation on Available-For-Sale Investments      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Net realized gains (losses) (431) (235) 157
Provision for credit losses 3 (44) (2)
Income (loss) before income taxes (428) (279) 155
Income tax (expense) benefit 28 32 (38)
Net of tax $ (400) $ (247) $ 117