Equity-Based Compensation Information Related to Restricted Stock Units and Awards (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Information Related to Restricted Stock Units [Abstract] | |||
| Pretax expense for RSUs and RSAs | $ 68 | $ 81 | $ 69 |
| After-tax expense for RSUs and RSAs | 44 | 53 | 45 |
| Fair value of vested RSUs and RSAs | $ 110 | $ 105 | $ 82 |