v3.26.1
Other Comprehensive Income (Loss) - Tax effects on components of 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
Before tax amount:        
Other comprehensive income (loss), before tax $ (18) $ 360 $ (407) $ 694
Tax expense (benefit):        
Other comprehensive income (loss), tax 62 0 11 22
Net of tax amount:        
Other comprehensive income (loss), net of tax (80) 360 (418) 672
Unrealized appreciation (decline) in value of available-for-sale securities, net of deferred income tax        
Before tax amount:        
Unrealized holding gains (losses) arising during period, before tax (63) 304 (430) 549
Less reclassification of net realized gains included in net income, before tax (52) 6 (30) (57)
Tax expense (benefit):        
Unrealized holding gains (losses) arising during period, tax 50 1 3 12
Less reclassification of net realized gains included in net income, tax (10) (1) (6) (12)
Net of tax amount:        
Unrealized holding gains (losses) arising during period, net of tax (113) 303 (433) 537
Less reclassification of net realized gains included in net income, net of tax (42) 7 (24) (45)
Other comprehensive income (loss), net of tax (71) 296 (409) 582
Foreign currency translation adjustments, net of deferred income tax        
Before tax amount:        
Other comprehensive income (loss), before tax (7) 62 (7) 88
Tax expense (benefit):        
Other comprehensive income (loss), tax 2 (2) 2 (2)
Net of tax amount:        
Other comprehensive income (loss), net of tax $ (9) $ 64 $ (9) $ 90