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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

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