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Loan Receivables and Allowance for Loan Losses - Loans Entered into a Loan Modification Program (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans entered into a modification program $ 193 $ 197 $ 409 $ 419
Credit cards        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans entered into a modification program 192 196 407 417
Consumer installment loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans entered into a modification program 0 0 0 0
Commercial credit products        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans entered into a modification program $ 1 $ 1 $ 2 $ 2