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Other Comprehensive Income (Loss) - Tax effects on components of other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net of tax amount:      
Unrealized holding gains (losses) arising during period, net of tax $ 661 $ (23) $ 547
Accumulated other comprehensive income (loss)      
Before tax amount:      
Unrealized holding gains (losses) arising during period, before tax 707 (23) 617
Less reclassification of net realized gains (losses) included in net income, before tax 19 (95) (428)
Foreign currency translation adjustments, before tax 86 (105) 23
Other comprehensive income (loss), before tax 774 (33) 1,068
Tax expense (benefit):      
Unrealized holding gains (losses) arising during period, tax 46 0 70
Less reclassification of net realized gains (losses) included in net income, tax (1) (14) (28)
Foreign currency translation adjustments, tax 2 (3) 0
Other comprehensive income (loss), tax 49 11 98
Net of tax amount:      
Unrealized holding gains (losses) arising during period, net of tax 661 (23) 547
Less reclassification of net realized gains (losses) included in net income, net of tax 20 (81) (400)
Foreign currency translation adjustments, net of tax 84 (102) 23
Net current period other comprehensive income (loss) $ 725 $ (44) $ 970