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Other Comprehensive Income (Loss) - Components of other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Before tax amount:        
Unrealized holding gains (losses) arising during period, before tax $ 118 $ 736 $ 667 $ 549
Less reclassification of net realized gains included in net income, before tax 48 60 (9) (34)
Foreign currency translation adjustments, before tax 0 25 88 (24)
Other comprehensive income (loss), before tax 70 701 764 559
Tax expense (benefit):        
Unrealized holding gains (losses) arising during period, tax 30 91 42 71
Less reclassification of net realized gains included in net income, tax 7 0 (5) (12)
Foreign currency translation adjustments, tax (1) 0 (3) 0
Other comprehensive income (loss), tax 22 91 44 83
Net of tax amount:        
Unrealized holding gains (losses) arising during period, net of tax 88 645 625 478
Less reclassification of net realized gains included in net income, net of tax 41 60 (4) (22)
Foreign currency translation adjustments, net of tax 1 25 91 (24)
Net current period other comprehensive income (loss) $ 48 $ 610 $ 720 $ 476