v3.26.1
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period     $ 32,894  
Other comprehensive income (loss), net of taxes $ 410 $ 483 (168) $ 882
Balance, end of period 33,121 29,518 33,121 29,518
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes 519 569 (308) 1,067
Income tax expense (benefit) 109 86 (140) 185
Other comprehensive income (loss), net of taxes 410 483 (168) 882
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period (3,078) (4,568) (2,500) (4,967)
Other comprehensive income (loss) (OCI) before reclassifications, net of tax 386   (544)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 24   376  
Other comprehensive income (loss), net of taxes 410 483 (168) 882
Balance, end of period (2,668) (4,085) (2,668) (4,085)
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes 519 569 (308) 1,067
Income tax expense (benefit) 109 86 (140) 185
Other comprehensive income (loss), net of taxes 410 483 (168) 882
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 (2,564)   (1,664)  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax 394   (508)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 25   27  
Other comprehensive income (loss), net of taxes 419 268 (481) 608
Balance, end of period (2,145)   (2,145)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes 531 341 (615) 777
Income tax expense (benefit) 112 73 (134) 169
Other comprehensive income (loss), net of taxes 419 268 (481) 608
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   186  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax (1)   (1)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0   0  
Other comprehensive income (loss), net of taxes (1) 0 (1) 1
Balance, end of period 185   185  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes (1) 0 (1) 1
Income tax expense (benefit) 0 0 0 0
Other comprehensive income (loss), net of taxes (1) 0 (1) 1
Net Benefit Plan Assets and Obligations Recognized in Shareholders' Equity [Member]        
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period (156)   (150)  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax 0   0  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (1)   (7)  
Other comprehensive income (loss), net of taxes (1) 0 (7) 0
Balance, end of period (157)   (157)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes (2) 0 (10) 0
Income tax expense (benefit) (1) 0 (3) 0
Other comprehensive income (loss), net of taxes (1) 0 (7) 0
Net Unrealized Foreign Currency Translation [Member]        
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period (544)   (872)  
Other comprehensive income (loss) (OCI) before reclassifications, net of tax (7)   (35)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0   356  
Other comprehensive income (loss), net of taxes (7) 215 321 273
Balance, end of period (551)   (551)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes (9) 228 318 289
Income tax expense (benefit) (2) 13 (3) 16
Other comprehensive income (loss), net of taxes $ (7) $ 215 $ 321 $ 273