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Customer Deposits - Categorized as Interest or Non-interest Bearing (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
U.S.:    
Interest-bearing $ 138,433 $ 128,146
Non-interest-bearing (includes Card Member credit balances of: 2024, $513; 2023, $495) 566 557
Non-U.S.:    
Interest-bearing 17 12
Non-interest-bearing (includes Card Member credit balances of: 2024, $395; 2023, $426) 397 429
Total customer deposits 139,413 129,144
Card Member Credit Balances    
U.S.:    
Non-interest-bearing (includes Card Member credit balances of: 2024, $513; 2023, $495) 513 495
Non-U.S.:    
Non-interest-bearing (includes Card Member credit balances of: 2024, $395; 2023, $426) $ 395 $ 426