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Other Comprehensive Income (Loss) - Components of other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Before tax amount:    
Unrealized holding gains (losses) arising during period, before tax $ (151) $ 281
Less reclassification of net realized gains included in net income, before tax (34) (110)
Foreign currency translation adjustments, before tax (33) 5
Other comprehensive income (loss), before tax (150) 396
Tax expense (benefit):    
Unrealized holding gains (losses) arising during period, tax (10) 36
Less reclassification of net realized gains included in net income, tax (5) (11)
Foreign currency translation adjustments, tax 0 0
Other comprehensive income (loss), tax (5) 47
Net of tax amount:    
Unrealized holding gains (losses) arising during period, net of tax (141) 245
Less reclassification of net realized gains included in net income, net of tax (29) (99)
Foreign currency translation adjustments, net of tax (33) 5
Net current period other comprehensive income (loss) $ (145) $ 349