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DEPOSITS - Schedule of Deposits By Deposit Type (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Deposit Liability [Line Items]    
Certificates of deposit $ 6,074  
Cardholder credit balances 24 $ 25
Total deposits 14,732 13,916
Direct-to-consumer (retail)    
Deposit Liability [Line Items]    
Savings accounts 5,138 4,329
Certificates of deposit 4,220 4,193
Wholesale    
Deposit Liability [Line Items]    
Savings accounts 3,496 3,371
Certificates of deposit 1,854 1,998
Cardholder credit balances    
Deposit Liability [Line Items]    
Cardholder credit balances $ 24 $ 25