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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - Options
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Options, Number of Shares Roll Forward  
Outstanding at January 1, 2016 | shares 3,150
Granted | shares 300
Exercised | shares (10)
Forfeited/Expired | shares (10)
Outstanding at March 31, 2016 (a) | shares 3,430 [1]
Options, Weighted Average Exercise Price Roll Forward  
Outstanding at January 1, 2016 | $ / shares $ 31.42
Granted | $ / shares 32.63
Exercised | $ / shares 20.77
Forfeited/Expired | $ / shares 32.28
Outstanding at March 31, 2016 (a) | $ / shares $ 31.55 [1]
Intrinsic value of outstanding options | $ $ 31
Weighted average remaining contractual life of outstanding options 6 years 8 months
[1] Options outstanding at March 31, 2016 have an intrinsic value of $31 million and have a weighted average remaining contractual life of 6.7 years.