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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 1,468 | $ 1,416 | $ 2,858 | $ 2,694
Revenue from other sources | 492 | 483 | 1,016 | 922
Total non-interest income | 1,960 | 1,899 | 3,874 | 3,616
Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,199 | 1,202 | 2,340 | 2,282
Revenue from other sources | 307 | 297 | 642 | 580
Total non-interest income | 1,506 | 1,499 | 2,982 | 2,862
Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 167 | 141 | 313 | 267
Revenue from other sources | 5 | 8 | 18 | 17
Total non-interest income | 172 | 149 | 331 | 284
Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 102 | 73 | 205 | 145
Revenue from other sources | 169 | 184 | 347 | 324
Total non-interest income | 271 | 257 | 552 | 469
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 0 | 0 | 0 | 0
Revenue from other sources | 11 | (6) | 9 | 1
Total non-interest income | 11 | (6) | 9 | 1
Interchange fees, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,249 | 1,213 | 2,394 | 2,352
Interchange fees, net | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,116 | 1,111 | 2,136 | 2,136
Interchange fees, net | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 107 | 92 | 205 | 178
Interchange fees, net | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 26 | 10 | 53 | 37
Interchange fees, net | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 0 | 0 | 0 | 1
Service charges and other customer-related fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 96 | 77 | 190 | 137
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 | 22 | 22 | 43 | 43
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 74 | 55 | 147 | 95
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 | 123 | 126 | 274 | 205
Other | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 83 | 91 | 204 | 146
Other | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 38 | 27 | 65 | 46
Other | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 2 | 8 | 5 | 13
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 0 | $ 0 | $ 0 | $ 0

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