v3.26.1
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated other comprehensive income (loss) [Roll Forward]    
Balance, beginning of period $ 32,894  
Other comprehensive income (loss), net of taxes (578) $ 399
Balance, end of period 31,986 28,191
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)    
Other comprehensive income (loss), before income taxes (827) 498
Income tax expense (benefit) (249) 99
Other comprehensive income (loss), net of taxes (578) 399
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated other comprehensive income (loss) [Roll Forward]    
Balance, beginning of period (2,500) (4,967)
Other comprehensive income (loss) (OCI) before reclassifications, net of tax (930)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 352  
Other comprehensive income (loss), net of taxes (578) 399
Balance, end of period (3,078) (4,568)
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)    
Other comprehensive income (loss), before income taxes (827) 498
Income tax expense (benefit) (249) 99
Other comprehensive income (loss), net of taxes (578) 399
Changes in Net Unrealized Gains (Losses) on Investment Securities Having No Credit Losses Recognized in the Consolidated Statement of Income [Member]    
Accumulated other comprehensive income (loss) [Roll Forward]    
Balance, beginning of period (1,664)  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax (902)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 2  
Other comprehensive income (loss), net of taxes (900) 340
Balance, end of period (2,564)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)    
Other comprehensive income (loss), before income taxes (1,146) 436
Income tax expense (benefit) (246) 96
Other comprehensive income (loss), net of taxes (900) 340
Changes in Net Unrealized Gains (Losses) on Investment Securities Having Credit Losses Recognized in the Consolidated Statement of Income [Member]    
Accumulated other comprehensive income (loss) [Roll Forward]    
Balance, beginning of period 186  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax 0  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0  
Other comprehensive income (loss), net of taxes 0 1
Balance, end of period 186  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)    
Other comprehensive income (loss), before income taxes 0 1
Income tax expense (benefit) 0 0
Other comprehensive income (loss), net of taxes 0 1
Net Benefit Plan Assets and Obligations Recognized in Shareholders' Equity [Member]    
Accumulated other comprehensive income (loss) [Roll Forward]    
Balance, beginning of period (150)  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax 0  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (6)  
Other comprehensive income (loss), net of taxes (6) 0
Balance, end of period (156)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)    
Other comprehensive income (loss), before income taxes (8) 0
Income tax expense (benefit) (2) 0
Other comprehensive income (loss), net of taxes (6) 0
Net Unrealized Foreign Currency Translation [Member]    
Accumulated other comprehensive income (loss) [Roll Forward]    
Balance, beginning of period (872)  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax (28)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 356  
Other comprehensive income (loss), net of taxes 328 58
Balance, end of period (544)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)    
Other comprehensive income (loss), before income taxes 327 61
Income tax expense (benefit) (1) 3
Other comprehensive income (loss), net of taxes $ 328 $ 58