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Customer Deposits - Categorized as Interest or Non-interest Bearing (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
U.S.:    
Interest-bearing $ 145,494 $ 138,433
Non-interest-bearing (includes Card Member credit balances of: 2025, $440; 2024, $513) 501 566
Non-U.S.:    
Interest-bearing 17 17
Non-interest-bearing (includes Card Member credit balances of: 2025, $381; 2024, $395) 384 397
Total customer deposits 146,396 139,413
Card Member Credit Balances    
U.S.:    
Non-interest-bearing (includes Card Member credit balances of: 2025, $440; 2024, $513) 440 513
Non-U.S.:    
Non-interest-bearing (includes Card Member credit balances of: 2025, $381; 2024, $395) $ 381 $ 395