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Customer Deposits - Categorized as Interest or Non-interest Bearing (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
U.S.:    
Interest-bearing $ 134,476 $ 128,146
Non-interest-bearing (includes Card Member credit balances of: 2024, $483; 2023, $495) 532 557
Non-U.S.:    
Interest-bearing 17 12
Non-interest-bearing (includes Card Member credit balances of: 2024, $410; 2023, $426) 413 429
Total customer deposits 135,438 129,144
Card Member Credit Balances    
U.S.:    
Non-interest-bearing (includes Card Member credit balances of: 2024, $483; 2023, $495) 483 495
Non-U.S.:    
Non-interest-bearing (includes Card Member credit balances of: 2024, $410; 2023, $426) $ 410 $ 426