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DEPOSITS - Customer Deposits Based on Deposit Type (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Deposit Liability [Line Items]    
Certificates of deposit $ 5,697  
Cardholder credit balances 37  
Total deposits 12,444 $ 11,027
Direct-to-consumer    
Deposit Liability [Line Items]    
Savings accounts 2,901 1,713
Certificates of deposit 2,275 1,467
Wholesale    
Deposit Liability [Line Items]    
Savings accounts 3,809 3,873
Certificates of deposit 3,422 $ 3,974
Cardholder credit balances    
Deposit Liability [Line Items]    
Cardholder credit balances $ 37