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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Allowance for Credit Losses and Reserve for Unfunded Lending Commitments Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance     $ 11,430  
Balance at the end of the period $ 12,209   12,209  
Provision (benefit) for credit losses 1,669 $ (342) 3,431 $ (2,325)
Financing Receivable Allowance For Credit Loss Translation Adjustments And Purchase Credit Deteriorated Loans 10 6 10 6
Other        
Allowance for Credit Losses [Roll Forward]        
Provision (benefit) for credit losses 0 0 (5) (2)
Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 11,491 12,346 11,430 15,564
Allowance build (release) for credit losses 734 (770) 815 (4,001)
Other changes (16) (3) (36) 10
Balance at the end of the period 12,209 11,573 12,209 11,573
Financing Receivable, Allowance for Credit Loss, Writeoff (1,470) (1,019) (4,174) (3,608)
Recoveries 539 593 1,631 1,901
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (931) (426) (2,543) (1,707)
Provision (benefit) for credit losses 1,665 (344) 3,358 (2,294)
Increase (Decrease) in Allowance for Credit Loss     779  
Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 239 164 165 195
Balance at the end of the period 243 166 243 166
Provision (benefit) for credit losses 4 2 78 (29)
Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 12,452 11,739 12,452 11,739
Credit Card | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 8,166 8,873 8,345 11,191
Allowance build (release) for credit losses 566 (564) 407 (2,895)
Other changes (16) (3) (36) 10
Balance at the end of the period 8,716 8,306 8,716 8,306
Financing Receivable, Allowance for Credit Loss, Writeoff (1,047) (735) (3,011) (2,695)
Recoveries 352 369 1,031 1,125
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (695) (366) (1,980) (1,570)
Provision (benefit) for credit losses 1,261 (198) 2,387 (1,325)
Credit Card | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 0 0 0 0
Balance at the end of the period 0 0 0 0
Provision (benefit) for credit losses 0 0 0 0
Credit Card | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 8,716 8,306 8,716 8,306
Consumer Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 2,047 2,203 1,918 2,715
Allowance build (release) for credit losses 61 (142) 190 (654)
Other changes 0 0 0 0
Balance at the end of the period 2,108 2,061 2,108 2,061
Financing Receivable, Allowance for Credit Loss, Writeoff (410) (264) (1,090) (866)
Recoveries 186 213 584 735
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (224) (51) (506) (131)
Provision (benefit) for credit losses 285 (91) 696 (523)
Consumer Banking | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 0 0 0 0
Balance at the end of the period 0 0 0 0
Provision (benefit) for credit losses 0 0 0 0
Consumer Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 2,108 2,061 2,108 2,061
Commercial Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 1,278 1,270 1,167 1,658
Allowance build (release) for credit losses 107 (64) 218 (452)
Other changes 0 0 0 0
Balance at the end of the period 1,385 1,206 1,385 1,206
Financing Receivable, Allowance for Credit Loss, Writeoff (13) (20) (73) (47)
Recoveries 1 11 16 41
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (12) (9) (57) (6)
Provision (benefit) for credit losses 119 (55) 275 (446)
Commercial Banking | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Financing Receivable, Allowance for Credit Loss, Beginning Balance 239 164 165 195
Balance at the end of the period 243 166 243 166
Provision (benefit) for credit losses 4 2 78 (29)
Commercial Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period $ 1,628 $ 1,372 $ 1,628 $ 1,372