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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
May 18, 2025
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period     $ 16,258    
Benefit from expected recoveries of charged off loans     (2,179) $ (1,374)  
Provision for credit losses $ (11,430) $ (3,909) (13,799) (6,592)  
Allowance build for credit losses     7,600    
Balance at the end of the period 23,873   23,873    
Discover          
Allowance for Credit Losses [Roll Forward]          
Unpaid principal balance         $ 19,400
Business combination, expected recovery in allowance for credit losses         $ 3,300
Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 15,899 15,380 16,258 15,296  
Charge-offs (4,283) (3,361) (7,975) (6,634)  
Recoveries 1,223 717 2,179 1,374  
Net charge-offs (3,060) (2,644) (5,796) (5,260)  
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 11,440 (3,914) 13,808 (6,621)  
Allowance build for credit losses 7,945 1,270 7,577 1,361  
Other changes 29 (1) 38 (8)  
Balance at the end of the period 23,873 16,649 23,873 16,649  
Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 144 134 143 158  
Provision for credit losses 9 5 8 29  
Balance at the end of the period 135 129 135 129  
Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period 24,008 16,778 24,008 16,778  
Credit Card: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 12,510 11,754 12,974 11,709  
Charge-offs (3,590) (2,686) (6,568) (5,260)  
Recoveries 862 428 1,441 795  
Net charge-offs (2,728) (2,258) (5,127) (4,465)  
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 11,098 (3,545) 13,024 (5,804)  
Allowance build for credit losses 7,935 1,287 7,462 1,339  
Other changes 29 (1) 38 (8)  
Balance at the end of the period 20,474 13,040 20,474 13,040  
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 20,474 13,040 20,474 13,040  
Consumer Banking: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 1,872 2,088 1,884 2,042  
Charge-offs (612) (636) (1,288) (1,296)  
Recoveries 352 283 715 563  
Net charge-offs (260) (353) (573) (733)  
Initial allowance for purchased credit deteriorated loans 0   0    
Benefit from expected recoveries of charged off loans 0   0    
Provision for credit losses 252 (330) 553 (756)  
Allowance build for credit losses (8) (23) (20) 23  
Other changes 0 0 0 0  
Balance at the end of the period 1,864 2,065 1,864 2,065  
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 1,864 2,065 1,864 2,065  
Commercial Banking: | Allowance for credit losses          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 1,517 1,538 1,400 1,545  
Charge-offs (81) (39) (119) (78)  
Recoveries 9 6 23 16  
Net charge-offs (72) (33) (96) (62)  
Initial allowance for purchased credit deteriorated loans 0   0    
Benefit from expected recoveries of charged off loans 0   0    
Provision for credit losses 90 (39) 231 (61)  
Allowance build for credit losses 18 6 135 (1)  
Other changes 0 0 0 0  
Balance at the end of the period 1,535 1,544 1,535 1,544  
Commercial Banking: | Reserve for unfunded lending commitments          
Allowance for Credit Losses [Roll Forward]          
Balance at beginning of the period 144 134 143 158  
Provision for credit losses 9 5 8 29  
Balance at the end of the period 135 129 135 129  
Commercial Banking: | Combined allowance and reserve          
Allowance for Credit Losses [Roll Forward]          
Balance at the end of the period $ 1,670 $ 1,673 $ 1,670 $ 1,673