Loan Receivables and Allowance for Loan Losses - Payment Defaults (Details) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2016
USD ($)
contract
|
Dec. 31, 2015
USD ($)
contract
|
Dec. 31, 2014
USD ($)
contract
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Accounts defaulted | contract | 35,732 | 28,221 | 29,472 |
| Loans defaulted | $ | $ 73 | $ 57 | $ 61 |
| Credit cards | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Accounts defaulted | contract | 35,648 | 28,126 | 29,313 |
| Loans defaulted | $ | $ 72 | $ 56 | $ 60 |
| Consumer installment loans | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Accounts defaulted | contract | 0 | 0 | 0 |
| Loans defaulted | $ | $ 0 | $ 0 | $ 0 |
| Commercial credit products | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Accounts defaulted | contract | 84 | 95 | 159 |
| Loans defaulted | $ | $ 1 | $ 1 | $ 1 |