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Share-Based Compensation	9 Months Ended
Share-Based Compensation	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation The Company recognized $15 million and $54 million of share-based compensation expense during the three and nine months ended September 30, 2016, respectively, and $15 million and $51 million of share-based compensation expense during the three and nine months ended September 30, 2015, respectively. The Company’s annual grant of share-based awards generally occurs in the first quarter. During the nine months ended September 30, 2016, the Company granted 0.9 million stock options and 0.5 million restricted and performance-based stock units at weighted-average estimated fair values of $31.43 and $98.24, respectively. During the nine months ended September 30, 2015, the Company granted 1.1 million stock options and 0.3 million restricted stock units at weighted-average estimated fair values of $25.50 and $79.20, respectively. During the nine months ended September 30, 2016 and 2015, stock options to purchase 1.6 million and 1.9 million shares, respectively, were exercised.