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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 1,844 | $ 1,468 | $ 3,333 | $ 2,858
Revenue (reduction) from other sources | 653 | 492 | 1,151 | 1,016
Total non-interest income | 2,497 | 1,960 | 4,484 | 3,874
Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,352 | 1,199 | 2,548 | 2,340
Revenue (reduction) from other sources | 450 | 307 | 765 | 642
Total non-interest income | 1,802 | 1,506 | 3,313 | 2,982
Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 379 | 167 | 563 | 313
Revenue (reduction) from other sources | 15 | 5 | 14 | 18
Total non-interest income | 394 | 172 | 577 | 331
Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 112 | 102 | 221 | 205
Revenue (reduction) from other sources | 223 | 169 | 426 | 347
Total non-interest income | 335 | 271 | 647 | 552
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1 | 0 | 1 | 0
Revenue (reduction) from other sources | (35) | 11 | (54) | 9
Total non-interest income | (34) | 11 | (53) | 9
Interchange fees, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,478 | 1,249 | 2,701 | 2,394
Interchange fees, net | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,207 | 1,116 | 2,292 | 2,136
Interchange fees, net | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 248 | 107 | 363 | 205
Interchange fees, net | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 23 | 26 | 46 | 53
Interchange fees, net | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 0 | 0 | 0 | 0
Service charges and other customer-related fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 181 | 96 | 286 | 190
Service charges and other customer-related fees | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 20 | 0 | 20 | 0
Service charges and other customer-related fees | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 78 | 22 | 98 | 43
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 82 | 74 | 167 | 147
Service charges and other customer-related fees | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1 | 0 | 1 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 185 | 123 | 346 | 274
Other | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 125 | 83 | 236 | 204
Other | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 53 | 38 | 102 | 65
Other | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 7 | 2 | 8 | 5
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 0 | $ 0 | $ 0 | $ 0

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