Noninterest Revenue and Noninterest Expense - Card Income (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 card income | $ 1,344 | $ 1,332 | $ 2,560 | $ 2,550 |
| Interchange and merchant processing income | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | 9,159 | 8,520 | 17,557 | 16,351 |
| Rewards costs and partner payments | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | (7,350) | (6,789) | (14,135) | (12,960) |
| All other | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | $ (465) | $ (399) | $ (862) | $ (841) |
| Deferred revenues, recognition period | 12 months | 12 months | ||