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Long-Term Debt - Additional Information (Detail)
$ / shares in Units, € in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 11, 2017
USD ($)
Oct. 02, 2017
USD ($)
shares
Jul. 03, 2017
USD ($)
$ / shares
shares
Oct. 03, 2016
USD ($)
shares
Jul. 03, 2014
USD ($)
$ / shares
Oct. 10, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 03, 2014
USD ($)
$ / shares
Dec. 31, 2017
EUR (€)
Aug. 31, 2017
EUR (€)
Mar. 12, 2013
USD ($)
Mar. 12, 2013
EUR (€)
Debt Instrument [Line Items]                              
Net proceeds from issuance of senior unsecured convertible bonds               $ 1,502,000,000              
Conversion price adjusted   1.16%   1.24%                      
Debt Conversion, Converted Instrument, Shares Issued | shares               4,300,000              
Debt conversion, bond par value           $ 400,000,000                  
Conversion features of the instruments value     $ 242,000,000         $ 242,000,000 $ 121,000,000 $ 0          
Allocated debt issuance costs     1,000,000   $ 1,000,000 340,000,000   95,000,000              
Unamortized debt discount and issuance costs totalled               221,000,000 $ 74,000,000            
Debt Conversion,Cash redemption $ 60,000,000                            
Loss on financial instruments, net               (16,000,000)              
Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Net proceeds from issuance of senior unsecured convertible bonds     1,502,000,000   994,000,000                    
Medium Term Credit Facilities [Member]                              
Debt Instrument [Line Items]                              
Unutilized committed medium term credit facilities               580,000,000              
Multi Currency Loan to Support our Industrial and R&D Programs [Member]                              
Debt Instrument [Line Items]                              
Line of credit outstanding amount | €                             € 350
Amount outstanding               235,000,000              
Line of credit amount withdrawn                           $ 471,000,000  
Fair Value, Inputs, Level 3 [Member]                              
Debt Instrument [Line Items]                              
Fair value of liability component     $ 1,266,000,000   $ 878,000,000           $ 878,000,000        
Europe [Member] | Multi Currency Loan to Support our Industrial and R&D Programs [Member]                              
Debt Instrument [Line Items]                              
Line of credit outstanding amount | €                       € 350      
Amount outstanding               166,000,000              
Line of credit amount withdrawn               $ 321,000,000       € 100      
Zero Coupon due 2019 (Tranche A) [Member]                              
Debt Instrument [Line Items]                              
Interest rate         1.00%           1.00%        
Senior unsecured convertible bonds conversion premium rate         30.00%           30.00%        
Debt conversion, bond par value             $ 600,000,000                
Debt discount rate             2.09% 2.09%   2.40% 2.40%        
Conversion features of the instruments value             $ 0                
Allocated debt issuance costs             598,000,000                
Debt Conversion,Cash redemption             $ 2,000,000                
Zero Coupon due 2019 (Tranche A) [Member] | Treasury Stock [Member]                              
Debt Instrument [Line Items]                              
Debt Conversion, Converted Instrument, Shares Issued | shares             13,000,000                
Zero Coupon due 2019 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Debt instrument principal amount         $ 600,000,000           $ 600,000,000        
Long-term debt maturity date               2019              
Interest rate         0.00%     0.00%     0.00% 0.00%      
Percentage at which bonds issued     101.265%                        
Zero Coupon due 2019 (Tranche A) [Member] | Fair Value, Inputs, Level 3 [Member]                              
Debt Instrument [Line Items]                              
Fair value of liability component             $ 574,000,000 $ 574,000,000              
Loss on financial instruments, net             $ 5,000,000 $ 5,000,000              
1.0% due 2021 (Tranche B) [Member]                              
Debt Instrument [Line Items]                              
Debt instrument periodic payment               Semi-annually              
Interest rate         1.00%           1.00%        
Senior unsecured convertible bonds conversion premium rate         31.00%           31.00%        
Debt conversion, bond par value           $ 60,000,000                  
Debt discount rate           2.47%   2.47%   3.22% 3.22%        
Conversion features of the instruments value           $ 0                  
Allocated debt issuance costs           59,000,000                  
Debt Conversion,Cash redemption           $ 1,000,000                  
1.0% due 2021 (Tranche B) [Member] | Treasury Stock [Member]                              
Debt Instrument [Line Items]                              
Debt Conversion, Converted Instrument, Shares Issued | shares           13,700,000                  
1.0% due 2021 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Debt instrument principal amount         $ 400,000,000           $ 400,000,000        
Long-term debt maturity date               2021              
Interest rate         1.00%     1.00%     1.00% 1.00%      
1.0% due 2021 (Tranche B) [Member] | Fair Value, Inputs, Level 3 [Member]                              
Debt Instrument [Line Items]                              
Fair value of liability component           $ 370,000,000   $ 370,000,000              
Loss on financial instruments, net           $ 11,000,000   $ 11,000,000              
Zero-coupon, due 2022 (Tranche A) [Member]                              
Debt Instrument [Line Items]                              
Debt discount rate               2.70% 2.70%            
Zero-coupon, due 2022 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Long-term debt maturity date               2022              
Interest rate               0.00%       0.00%      
0.25%, due 2024 (Tranche B) [Member]                              
Debt Instrument [Line Items]                              
Interest rate               0.25%       0.25%      
Debt discount rate               3.28% 3.28%            
0.25%, due 2024 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Long-term debt maturity date               2024              
Interest rate               0.25%       0.25%      
Dual Tranche Senior Unsecured Convertible Bonds [Member] | Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Debt instrument principal amount     $ 1,500,000,000   $ 1,000,000,000           $ 1,000,000,000        
Senior unsecured convertible bonds conversion price | $ / shares     $ 20.54   $ 12           $ 12        
Tranche One [Member]                              
Debt Instrument [Line Items]                              
Debt Conversion, Converted Instrument, Shares Issued | shares   16,178 9,737 16,491                      
Debt conversion, bond par value   $ 200,000 $ 200,000 $ 200,000                      
Tranche Two [Member]                              
Debt Instrument [Line Items]                              
Net proceeds from issuance of senior unsecured convertible bonds   $ 994                          
Debt Conversion, Converted Instrument, Shares Issued | shares     9,737 16,366                      
Zero Coupon Due 2022 (Tranche A) [Member]                              
Debt Instrument [Line Items]                              
Senior unsecured convertible bonds conversion premium rate     37.50%                        
Zero Coupon Due 2022 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Debt instrument principal amount     $ 750,000,000                        
Long-term debt maturity date               2022              
0.25% due 2022(Tranche B) [Member]                              
Debt Instrument [Line Items]                              
Debt instrument periodic payment               Semi-annually              
Senior unsecured convertible bonds conversion premium rate     37.50%                        
0.25% due 2022(Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member]                              
Debt Instrument [Line Items]                              
Debt instrument principal amount     $ 750,000,000                        
Long-term debt maturity date               2024              
Interest rate     0.25%                        
New Medium Term Credit Facility [Member] | Europe [Member] | Multi Currency Loan to Support our Industrial and R&D Programs [Member]                              
Debt Instrument [Line Items]                              
Line of credit outstanding amount | €                         € 500    
Line of credit amount withdrawn               $ 0