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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Options, Weighted Average Exercise Price Roll Forward    
Intrinsic value of options exercised $ 4  
Proceeds from exercise of stock options 3 $ 2
Intrinsic value of outstanding options $ 34  
Weighted average remaining contractual life of outstanding options 6 years 10 months 23 days  
Options    
Options, Number of Shares Roll Forward    
Outstanding at January 1, 2015 3,220,000.00  
Granted 180,000.00  
Exercised (a) (b) [1],[2] (160,000.00)  
Forfeited/Expired (30,000.00)  
Outstanding at September 30, 2015 (c) [3] 3,210,000.00  
Options, Weighted Average Exercise Price Roll Forward    
Outstanding at January 1, 2015 $ 30.02  
Granted 46.45  
Exercised (a) (b) [1],[2] 21.31  
Forfeited/Expired 34.33  
Outstanding at September 30, 2015 (c) [3] $ 31.31  
[1] Cash received from options exercised during the nine months ended September 30, 2015 was $3 million.
[2] The intrinsic value of options exercised during the nine months ended September 30, 2015 was $4 million.
[3] Options outstanding at September 30, 2015 have an intrinsic value of $34 million and have a weighted average remaining contractual life of 6.9 years.