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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - Options
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Options, Number of Shares Roll Forward  
Outstanding at January 1, 2017 | shares 3.3
Granted | shares 0.4
Exercised | shares 0.0
Forfeited/Expired | shares 0.0
Outstanding at March 31, 2017 (a) | shares 3.7 [1]
Options, Weighted Average Exercise Price Roll Forward  
Outstanding at January 1, 2017 | $ / shares $ 31.73
Granted | $ / shares 27.56
Exercised | $ / shares 0.00
Forfeited/Expired | $ / shares 0.00
Outstanding at March 31, 2017 (a) | $ / shares $ 31.31 [1]
Intrinsic value of outstanding options | $ $ 7
Weighted average remaining contractual life of outstanding options 6 years 2 months
[1] Options outstanding at March 31, 2017 have an intrinsic value of $7 million and have a weighted average remaining contractual life of 6.2 years.