Customer Deposits - Categorized as Interest or Non-interest Bearing (Details) - USD ($) $ in Millions |
Mar. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| U.S.: | ||
| Interest-bearing | $ 133,483 | $ 128,146 |
| Non-interest-bearing (includes Card Member credit balances of: 2024, $446; 2023, $495) | 511 | 557 |
| Non-U.S.: | ||
| Interest-bearing | 12 | 12 |
| Non-interest-bearing (includes Card Member credit balances of: 2024, $409; 2023, $426) | 412 | 429 |
| Total customer deposits | 134,418 | 129,144 |
| Card Member Credit Balances | ||
| U.S.: | ||
| Non-interest-bearing (includes Card Member credit balances of: 2024, $446; 2023, $495) | 446 | 495 |
| Non-U.S.: | ||
| Non-interest-bearing (includes Card Member credit balances of: 2024, $409; 2023, $426) | $ 409 | $ 426 |