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Debt and Other Commitments - Narrative (Details) - Convertible Senior Notes
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jun. 29, 2014
USD ($)
day
$ / shares
Jul. 01, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
2019 Notes      
Debt Instrument [Line Items]      
Stated rate   0.00%  
Principal amount of notes outstanding | $ $ 633 $ 633 $ 633
Effective interest rate used to measure fair value of converted notes upon conversion 2.90%    
Conversion rate 0.0039318    
Conversion price (in dollars per share) | $ / shares $ 254.34 $ 254.34  
Threshold note trading days 5    
Threshold consecutive note trading days 10    
Threshold percentage of note price trigger 98.00%    
Threshold common stock trading days 20    
Threshold consecutive common stock trading days 30    
Threshold percentage of common stock price trigger 130.00%    
2021 Notes      
Debt Instrument [Line Items]      
Stated rate   0.50%  
Principal amount of notes outstanding | $ $ 517 $ 517 $ 517
Effective interest rate used to measure fair value of converted notes upon conversion 3.50%    
Conversion rate 0.0039318    
Conversion price (in dollars per share) | $ / shares $ 254.34 $ 254.34  
Threshold note trading days 5    
Threshold consecutive note trading days 10    
Threshold percentage of note price trigger 98.00%    
Threshold common stock trading days 20    
Threshold consecutive common stock trading days 30    
Threshold percentage of common stock price trigger 130.00%    
Convertible Senior Notes Due 2019 and 2021      
Debt Instrument [Line Items]      
If-converted value in excess of principal | $   $ 127