Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details)

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Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 272,924 $ 264,810
Net change (1,816) 6,513
Ending balance 274,000 264,918
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (1,656) (6,633)
Ending balance (3,472) (120)
Debt Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 5,122 323
Net change (840) 4,795
Ending balance 4,282 5,118
Debit Valuation Adjustments    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (1,992) (1,494)
Net change 116 1,346
Ending balance (1,876) (148)
Derivatives    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 426 (400)
Net change (1,114) 417
Ending balance (688) 17
Employee Benefit Plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (4,266) (4,168)
Net change 51 43
Ending balance (4,215) (4,125)
Foreign Currency    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (946) (894)
Net change (29) (88)
Ending balance $ (975) $ (982)