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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 1,447 | $ 1,475 | $ 4,305 | $ 4,169
Revenue (reduction) from other sources | 491 | 468 | 1,507 | 1,390
Total non-interest income (loss) | 1,938 | 1,943 | 5,812 | 5,559
Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,153 | 1,226 | 3,493 | 3,508
Revenue (reduction) from other sources | 356 | 287 | 998 | 867
Total non-interest income (loss) | 1,509 | 1,513 | 4,491 | 4,375
Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 172 | 141 | 485 | 408
Revenue (reduction) from other sources | 10 | 1 | 28 | 18
Total non-interest income (loss) | 182 | 142 | 513 | 426
Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 121 | 108 | 326 | 253
Revenue (reduction) from other sources | 171 | 180 | 518 | 504
Total non-interest income (loss) | 292 | 288 | 844 | 757
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1 | 0 | 1 | 0
Revenue (reduction) from other sources | (46) | 0 | (37) | 1
Total non-interest income (loss) | (45) | 0 | (36) | 1
Interchange fees, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,228 | 1,234 | 3,622 | 3,586
Interchange fees, net | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,086 | 1,115 | 3,222 | 3,251
Interchange fees, net | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 113 | 92 | 318 | 270
Interchange fees, net | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 28 | 27 | 81 | 64
Interchange fees, net | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1 | 0 | 1 | 1
Service charges and other customer-related fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 115 | 99 | 305 | 236
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 | 23 | 21 | 66 | 64
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 92 | 78 | 239 | 173
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 | 104 | 142 | 378 | 347
Other | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 67 | 111 | 271 | 257
Other | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 36 | 28 | 101 | 74
Other | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1 | 3 | 6 | 16
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 0 | $ 0 | $ 0 | $ 0

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