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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Restricted Stock, Restricted Stock Unit, and Performance Unit Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Restricted Stock  
Equity Instruments Other than Options, Number of Shares Roll Forward  
Unvested at January 1, 2015 90
Granted 0
Vested (a) 0 [1]
Forfeited 0
Unvested at September 30, 2015 90
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward  
Unvested at January 1, 2015 | $ / shares $ 27.14
Granted | $ / shares 0.00
Vested (a) | $ / shares 0.00 [1]
Forfeited | $ / shares 0.00
Unvested at September 30, 2015 | $ / shares $ 27.14
Restricted Stock Units  
Equity Instruments Other than Options, Number of Shares Roll Forward  
Unvested at January 1, 2015 740
Granted 620
Vested (a) (300) [1]
Forfeited (20)
Unvested at September 30, 2015 1,040
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward  
Unvested at January 1, 2015 | $ / shares $ 45.83
Granted | $ / shares 46.52
Vested (a) | $ / shares 45.83 [1]
Forfeited | $ / shares 46.24
Unvested at September 30, 2015 | $ / shares $ 46.21
Fair value of awards vested | $ $ 14
Performance Share Units  
Equity Instruments Other than Options, Number of Shares Roll Forward  
Unvested at January 1, 2015 370 [2]
Granted 430 [2]
Vested (a) 0 [1],[2]
Forfeited 0 [2]
Unvested at September 30, 2015 800 [2]
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward  
Unvested at January 1, 2015 | $ / shares $ 46.63
Granted | $ / shares 44.69
Vested (a) | $ / shares 0.00 [1]
Forfeited | $ / shares 0.00
Unvested at September 30, 2015 | $ / shares $ 45.59
[1] The intrinsic value of options exercised during the nine months ended September 30, 2015 was $4 million.
[2] Cash received from options exercised during the nine months ended September 30, 2015 was $3 million.