Variable Interest Entities and Securitization Activities (Assets and Liabilities by Type of Activity) (Details) - USD ($) $ in Millions |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Variable Interest Entity | ||
| VIE assets | $ 1,135 | $ 1,801 |
| VIE liabilities | 86 | 463 |
| OSF | ||
| Variable Interest Entity | ||
| VIE assets | 267 | 378 |
| VIE liabilities | 0 | 3 |
| MABS | ||
| Variable Interest Entity | ||
| VIE assets | 59 | 249 |
| VIE liabilities | 38 | 210 |
| Other | ||
| Variable Interest Entity | ||
| VIE assets | 809 | 1,174 |
| VIE liabilities | $ 48 | $ 250 |