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Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Provision for credit losses $ 0 $ 3 $ (44)
Income before income taxes and income (loss) from operating affiliates 4,474 3,385 1,487
Income tax (expense) benefit (362) 873 (80)
Net of tax 4,312 4,443 1,476
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) (95) (431) (235)
Provision for credit losses 0 3 (44)
Income before income taxes and income (loss) from operating affiliates (95) (428) (279)
Income tax (expense) benefit 14 28 32
Net of tax $ (81) $ (400) $ (247)