Loans Held-for-Sale (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
| Loans held-for-sale | $ 3,393 | $ 3,393 | $ 2,576 | ||
| Net gain on loan sales | 94 | $ 68 | 259 | $ 242 | |
| Loans held-for-sale, other | 40 | 40 | 35 | ||
| Loans held-for-sale | |||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
| Net gain on loan sales | 94 | $ 68 | 244 | $ 242 | |
| Consumer loans | Residential first mortgage loans | |||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
| Loans held-for-sale | $ 3,400 | $ 3,400 | $ 2,600 | ||