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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 1,251 $ 982 $ 3,493 $ 2,724
Revenue (reduction) from other sources 423 844 1,103 1,422
Non-interest income (loss) 1,674 1,826 4,596 4,146
Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,028 812 2,860 2,239
Revenue (reduction) from other sources 235 201 685 530
Non-interest income (loss) 1,263 1,013 3,545 2,769
Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 127 101 378 316
Revenue (reduction) from other sources 0 6 34 14
Non-interest income (loss) 127 107 412 330
Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 96 68 255 171
Revenue (reduction) from other sources 210 169 548 484
Non-interest income (loss) 306 237 803 655
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 1 0 (2)
Revenue (reduction) from other sources (22) 468 (164) 394
Non-interest income (loss) (22) 469 (164) 392
Interchange fees, net        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,022 775 2,855 2,199
Interchange fees, net | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 930 703 2,598 2,003
Interchange fees, net | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 68 54 192 152
Interchange fees, net | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 24 17 65 45
Interchange fees, net | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 1 0 (1)
Service charges and other customer-related fees        
Disaggregation of Revenue [Line Items]        
Total contract revenue 113 92 318 260
Service charges and other customer-related fees | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 0 0
Service charges and other customer-related fees | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 42 42 131 137
Service charges and other customer-related fees | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 71 50 187 124
Service charges and other customer-related fees | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 0 (1)
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 116 115 320 265
Other | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 98 109 262 236
Other | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 17 5 55 27
Other | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 1 3 2
Other | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 0 $ 0 $ 0 $ 0