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Consolidated Statement of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 1,123 $ 975
Other comprehensive income (loss):    
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income (752) 1,308
Changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income 2 0
Net changes in benefit plan assets and obligations (1) (3)
Net changes in unrealized foreign currency translation (71) 37
Other comprehensive income (loss) before income taxes (822) 1,342
Income tax expense (benefit) (162) 283
Other comprehensive income (loss), net of taxes (660) 1,059
Comprehensive income $ 463 $ 2,034