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DEPOSITS - Customer Deposits Based on Deposit Type (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Deposit Liability [Line Items]    
Certificates of deposit $ 4,639  
Cardholder credit balances 29  
Total deposits 11,028 $ 11,027
Direct-to-consumer    
Deposit Liability [Line Items]    
Savings accounts 2,684 1,713
Certificates of deposit 1,507 1,467
Wholesale    
Deposit Liability [Line Items]    
Savings accounts 3,676 3,873
Certificates of deposit 3,132 $ 3,974
Cardholder credit balances    
Deposit Liability [Line Items]    
Cardholder credit balances $ 29