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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