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Debt and Other Commitments - Debt Narrative (Details) - Convertible Debt [Member]
$ / shares in Units, $ in Millions
1 Months Ended
Jun. 29, 2014
USD ($)
day
$ / shares
Dec. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Dec. 31, 2011
USD ($)
Debt Instrument [Line Items]        
Carrying value of equity component, net of issuance costs   $ 161 $ 161  
2019 Notes [Member]        
Debt Instrument [Line Items]        
Principal amount $ 633 633 633  
Interest rate on convertible senior notes 0.00%      
Conversion rate 0.0039318      
Threshold note trading days | day 5      
Threshold consecutive note trading days | day 10      
Threshold percentage of note price trigger 98.00%      
Threshold common stock trading days | day 20      
Threshold consecutive common stock trading days | day 30      
Threshold percentage of common stock price trigger 130.00%      
Effective interest rate used to measure fair value of convertible senior note 2.90%      
2021 Notes [Member]        
Debt Instrument [Line Items]        
Principal amount $ 517 $ 517 $ 517  
Interest rate on convertible senior notes 0.50%      
Conversion rate 0.0039318      
Threshold note trading days | day 5      
Threshold consecutive note trading days | day 10      
Threshold percentage of note price trigger 98.00%      
Threshold common stock trading days | day 20      
Threshold consecutive common stock trading days | day 30      
Threshold percentage of common stock price trigger 130.00%      
Effective interest rate used to measure fair value of convertible senior note 3.50%      
2019 and 2021 Notes [Member]        
Debt Instrument [Line Items]        
Principal amount $ 1,150      
Debt issuance price as a percentage of par 100.00%      
Net proceeds from issuance, after deducting offering expenses payable $ 1,132      
Conversion price (in dollars per share) | $ / shares $ 254.34      
Repurchase price, percent of principal 100.00%      
Fair value of liability component, upon issuance $ 972      
Carrying value of equity component, net of issuance costs 161      
Cash proceeds $ 1,133      
2016 Notes [Member]        
Debt Instrument [Line Items]        
Principal amount       $ 920
Interest rate on convertible senior notes       0.25%
Effective interest rate used to measure fair value of convertible senior note       4.50%