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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Options, Weighted Average Exercise Price Roll Forward    
Proceeds from exercise of stock options $ 1 $ 2
Options    
Options, Number of Shares Roll Forward    
Outstanding at January 1, 2016 3,150  
Granted 300  
Exercised (a) (b) [1],[2] (50)  
Forfeited/Expired (20)  
Outstanding at June 30, 2016 (c) [3] 3,380  
Options, Weighted Average Exercise Price Roll Forward    
Outstanding at January 1, 2016 $ 31.42  
Granted 32.63  
Exercised (a) (b) [1],[2] 20.82  
Forfeited/Expired 33.42  
Outstanding at June 30, 2016 (c) [3] $ 31.68  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 1  
Proceeds from exercise of stock options 1  
Intrinsic value of outstanding options $ 13  
Weighted average remaining contractual life of outstanding options 6 years 5 months  
[1] Cash received from options exercised during the six months ended June 30, 2016 was $1 million.
[2] The intrinsic value of options exercised during the six months ended June 30, 2016 was $1 million.
[3] Options outstanding at June 30, 2016 have an intrinsic value of $13 million and have a weighted average remaining contractual life of 6.4 years.