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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 2,283 | $ 1,447 | $ 5,616 | $ 4,305
Revenue (reduction) from other sources | 672 | 491 | 1,823 | 1,507
Total non-interest income | 2,955 | 1,938 | 7,439 | 5,812
Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,684 | 1,153 | 4,232 | 3,493
Revenue (reduction) from other sources | 527 | 356 | 1,292 | 998
Total non-interest income | 2,211 | 1,509 | 5,524 | 4,491
Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 464 | 172 | 1,027 | 485
Revenue (reduction) from other sources | 11 | 10 | 25 | 28
Total non-interest income | 475 | 182 | 1,052 | 513
Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 135 | 121 | 356 | 326
Revenue (reduction) from other sources | 183 | 171 | 609 | 518
Total non-interest income | 318 | 292 | 965 | 844
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 0 | 1 | 1 | 1
Revenue (reduction) from other sources | (49) | (46) | (103) | (37)
Total non-interest income | (49) | (45) | (102) | (36)
Interchange fees, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,812 | 1,228 | 4,513 | 3,622
Interchange fees, net | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1,521 | 1,086 | 3,813 | 3,222
Interchange fees, net | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 268 | 113 | 631 | 318
Interchange fees, net | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 23 | 28 | 69 | 81
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 | 292 | 115 | 578 | 305
Service charges and other customer-related fees | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 37 | 0 | 57 | 0
Service charges and other customer-related fees | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 144 | 23 | 242 | 66
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 111 | 92 | 278 | 239
Service charges and other customer-related fees | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 0 | 0 | 1 | 0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 179 | 104 | 525 | 378
Other | Operating segments | Credit Card |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 126 | 67 | 362 | 271
Other | Operating segments | Consumer Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 52 | 36 | 154 | 101
Other | Operating segments | Commercial Banking |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | 1 | 1 | 9 | 6
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total contract revenue | $ 0 | $ 0 | $ 0 | $ 0

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