v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
May 18, 2025
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period     $ 23,409    
Provision for credit losses $ (2,989) $ (11,430) (7,057) $ (13,799)  
Allowance build (release) for credit losses     (443)    
Balance at the end of the period 22,966   22,966    
Financial receivable, non-interest expense 252 170 496 278  
Discover          
Allowance for Credit Losses [Roll Forward]          
Unpaid principal balance         $ 19,400
Business combination, expected recovery in allowance for credit losses         (3,300)
Business combination, allowance for credit losses PCD loan         $ 8,800
Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 23,630 15,899 23,409 16,258  
Charge-offs (5,283) (4,283) (10,728) (7,975)  
Recoveries 1,641 1,223 3,239 2,179  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (3,642) (3,060) (7,489) (5,796)  
Initial allowance for purchased credit deteriorated loans   2,870   2,870  
Benefit from expected recoveries of charged off loans   (3,305)   (3,305)  
Provision for credit losses 2,980 11,440 7,057 13,808  
Allowance build (release) for credit losses (662) 7,945 (432) 7,577  
Other changes (2) 29 (11) 38  
Balance at the end of the period 22,966 23,873 22,966 23,873  
Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 133 144 142 143  
Provision for credit losses (9) 9 0 8  
Balance at the end of the period 142 135 142 135  
Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period 23,108 24,008 23,108 24,008  
Credit Card: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 20,049 12,510 20,066 12,974  
Charge-offs (4,458) (3,590) (9,099) (6,568)  
Recoveries 1,266 862 2,488 1,441  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (3,192) (2,728) (6,611) (5,127)  
Initial allowance for purchased credit deteriorated loans   2,870   2,870  
Benefit from expected recoveries of charged off loans   (3,305)   (3,305)  
Provision for credit losses 2,474 11,098 5,885 13,024  
Allowance build (release) for credit losses (718) 7,935 (726) 7,462  
Other changes (2) 29 (11) 38  
Balance at the end of the period 19,329 20,474 19,329 20,474  
Credit Card: | Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 0 0 0 0  
Provision for credit losses 0 0 0 0  
Balance at the end of the period 0 0 0 0  
Credit Card: | Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period 19,329 20,474 19,329 20,474  
Consumer Banking: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 2,047 1,872 1,892 1,884  
Charge-offs (702) (612) (1,437) (1,288)  
Recoveries 373 352 744 715  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (329) (260) (693) (573)  
Initial allowance for purchased credit deteriorated loans   0   0  
Benefit from expected recoveries of charged off loans   0   0  
Provision for credit losses 444 252 963 553  
Allowance build (release) for credit losses 115 (8) 270 (20)  
Other changes 0 0 0 0  
Balance at the end of the period 2,162 1,864 2,162 1,864  
Consumer Banking: | Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 0 0 0 0  
Provision for credit losses 0 0 0 0  
Balance at the end of the period 0 0 0 0  
Consumer Banking: | Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period 2,162 1,864 2,162 1,864  
Commercial Banking: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 1,534 1,517 1,451 1,400  
Charge-offs (123) (81) (192) (119)  
Recoveries 2 9 7 23  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (121) (72) (185) (96)  
Initial allowance for purchased credit deteriorated loans   0   0  
Benefit from expected recoveries of charged off loans   0   0  
Provision for credit losses 62 90 209 231  
Allowance build (release) for credit losses (59) 18 24 135  
Other changes 0 0 0 0  
Balance at the end of the period 1,475 1,535 1,475 1,535  
Commercial Banking: | Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 133 144 142 143  
Provision for credit losses (9) 9 0 8  
Balance at the end of the period 142 135 142 135  
Commercial Banking: | Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period $ 1,617 $ 1,670 $ 1,617 $ 1,670