v3.25.3
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period     $ 27,864  
Other comprehensive income, net of taxes $ 991 $ 1,977 1,873 $ 1,038
Balance, end of period 31,609 27,696 31,609 27,696
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes 1,275 2,490 2,342 1,318
Income tax expense (benefit) 284 513 469 280
Other comprehensive income, net of taxes 991 1,977 1,873 1,038
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period (4,085) (5,410) (4,967) (4,471)
Other comprehensive income (loss) before reclassifications, net of tax 989   1,833  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 2   40  
Other comprehensive income, net of taxes 991 1,977 1,873 1,038
Balance, end of period (3,094) (3,433) (3,094) (3,433)
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes 1,275 2,490 2,342 1,318
Income tax expense (benefit) 284 513 469 280
Other comprehensive income, net of taxes 991 1,977 1,873 1,038
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 (3,216)   (3,824)  
Other comprehensive income (loss) before reclassifications, net of tax 1,059   1,629  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 2   40  
Other comprehensive income, net of taxes 1,061 1,864 1,669 1,015
Balance, end of period (2,155)   (2,155)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes 1,347 2,370 2,124 1,294
Income tax expense (benefit) 286 506 455 279
Other comprehensive income, net of taxes 1,061 1,864 1,669 1,015
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 185   184  
Other comprehensive income (loss) before reclassifications, net of tax 0   1  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0   0  
Other comprehensive income, net of taxes 0 1 1 3
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 0 1 1 4
Income tax expense (benefit) 0 0 0 1
Other comprehensive income, net of taxes 0 1 1 3
Net Benefit Plan Assets and Obligations Recognized in Shareholders' Equity [Member]        
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period (224)   (224)  
Other comprehensive income (loss) before reclassifications, net of tax 0   0  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0   0  
Other comprehensive income, net of taxes 0 (1) 0 (3)
Balance, end of period (224)   (224)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes 0 (1) 0 (4)
Income tax expense (benefit) 0 0 0 (1)
Other comprehensive income, net of taxes 0 (1) 0 (3)
Net Unrealized Foreign Currency Translation [Member]        
Accumulated other comprehensive income (loss) [Roll Forward]        
Balance, beginning of period (830)   (1,103)  
Other comprehensive income (loss) before reclassifications, net of tax (70)   203  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0   0  
Other comprehensive income, net of taxes (70) 113 203 23
Balance, end of period (900)   (900)  
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit)        
Other comprehensive income (loss), before income taxes (72) 120 217 24
Income tax expense (benefit) (2) 7 14 1
Other comprehensive income, net of taxes $ (70) $ 113 $ 203 $ 23