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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | $ 5,915 | $ 5,645 | $ 5,417
Revenue (reduction) from other sources | 1,989 | 1,901 | 1,719
Total non-interest income (loss) | 7,904 | 7,546 | 7,136
Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 4,753 | 4,746 | 4,573
Revenue (reduction) from other sources | 1,323 | 1,194 | 1,198
Total non-interest income (loss) | 6,076 | 5,940 | 5,771
Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 664 | 555 | 485
Revenue (reduction) from other sources | 31 | 34 | (16)
Total non-interest income (loss) | 695 | 589 | 469
Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 496 | 344 | 361
Revenue (reduction) from other sources | 714 | 658 | 768
Total non-interest income (loss) | 1,210 | 1,002 | 1,129
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 2 | 0 | (2)
Revenue (reduction) from other sources | (79) | 15 | (231)
Total non-interest income (loss) | (77) | 15 | (233)
Interchange fees, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 4,882 | 4,793 | 4,606
Customer reward expenses | 9,000 | 8,200 | 7,600
Interchange fees, net | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 4,340 | 4,333 | 4,178
Interchange fees, net | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 434 | 367 | 320
Interchange fees, net | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 106 | 91 | 109
Interchange fees, net | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 2 | 2 | (1)
Service charges and other customer-related fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 460 | 306 | 327
Service charges and other customer-related fees | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 0 | 0 | 0
Service charges and other customer-related fees | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 88 | 86 | 91
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 372 | 222 | 236
Service charges and other customer-related fees | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 0 | (2) | 0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 573 | 546 | 484
Other | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 413 | 413 | 395
Other | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 142 | 102 | 74
Other | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 18 | 31 | 16
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | $ 0 | $ 0 | $ (1)

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