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Customer Deposits - By Deposit Type (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Deposits, by Type    
Savings and transaction accounts $ 89,877 $ 76,731
Certificates of deposit:    
Direct 4,925 2,765
Third-party (brokered) 13,303 13,331
Sweep accounts – Third-party (brokered) 15,411 16,297
Other deposits 61 71
Total customer deposits 124,439 110,239
Card Member Credit Balances    
Certificates of deposit:    
Card Member credit balances $ 862 $ 1,044