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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | $ 1,390 | $ 1,278
Revenue (reduction) from other sources | 524 | 439
Total non-interest income (loss) | 1,914 | 1,717
Operating segments | Credit Card |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 1,141 | 1,080
Revenue (reduction) from other sources | 335 | 283
Total non-interest income (loss) | 1,476 | 1,363
Operating segments | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 146 | 126
Revenue (reduction) from other sources | 13 | 9
Total non-interest income (loss) | 159 | 135
Operating segments | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 103 | 72
Revenue (reduction) from other sources | 178 | 140
Total non-interest income (loss) | 281 | 212
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 0 | 0
Revenue (reduction) from other sources | (2) | 7
Total non-interest income (loss) | (2) | 7
Interchange fees, net |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 1,145 | 1,139
Interchange fees, net | Operating segments | Credit Card |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 1,020 | 1,025
Interchange fees, net | Operating segments | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 98 | 86
Interchange fees, net | Operating segments | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 27 | 27
Interchange fees, net | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 0 | 1
Service charges and other customer-related fees |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 78 | 60
Service charges and other customer-related fees | Operating segments | Credit Card |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 0 | 0
Service charges and other customer-related fees | Operating segments | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 4 | 21
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 74 | 40
Service charges and other customer-related fees | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 0 | (1)
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 167 | 79
Other | Operating segments | Credit Card |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 121 | 55
Other | Operating segments | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 44 | 19
Other | Operating segments | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | 2 | 5
Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total contract revenue | $ 0 | $ 0

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