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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Restricted Stock Unit and Performance Unit Activity (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Restricted Stock Units (RSUs)  
Equity Instruments Other than Options, Number of Shares Roll Forward  
Unvested at January 1, 2017 | shares 1.4
Granted | shares 0.9
Vested (a) | shares (0.5) [1]
Forfeited | shares 0.0
Unvested at March 31, 2017 | shares 1.8
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward  
Unvested at January 1, 2017 | $ / shares $ 37.53
Granted | $ / shares 27.69
Vested (a) | $ / shares 40.63 [1]
Forfeited | $ / shares 0.00
Unvested at March 31, 2017 | $ / shares $ 31.41
Fair value of awards vested | $ $ 23
Performance Share Units  
Equity Instruments Other than Options, Number of Shares Roll Forward  
Unvested at January 1, 2017 | shares 1.0 [2]
Granted | shares 0.7 [2]
Vested (a) | shares 0.0 [2]
Forfeited | shares 0.0 [2]
Unvested at March 31, 2017 | shares 1.7 [2]
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward  
Unvested at January 1, 2017 | $ / shares $ 36.71
Granted | $ / shares 27.70
Vested (a) | $ / shares 0.00
Forfeited | $ / shares 0.00
Unvested at March 31, 2017 | $ / shares $ 32.74
[1] The total fair value of RSUs which vested during the three months ended March 31, 2017 was $23 million.
[2] The PSU amounts in the table are shown at the target amount of the award.