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Loan Receivables and Allowance for Credit Losses - Loans Entered into a Loan Modification Program (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans entered into a modification program $ 150 $ 198 $ 566 $ 551
Credit cards        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans entered into a modification program 149 197 564 549
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