Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Statement of Comprehensive Income [Abstract] | ||||
| Unrealized holding gain (loss) on securities, tax | $ 1 | $ (5) | $ (10) | $ (5) |
| Reclassification adjustment on sale of securities, tax | 2 | 0 | 3 | 0 |
| Unrealized gain (loss) on derivatives, tax | 0 | 2 | 23 | 2 |
| Reclassification adjustment on derivatives, tax | $ (2) | $ 0 | $ (6) | $ 0 |