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Long-Term Debt - Additional Information (Detail)
$ / shares in Units, € in Millions
6 Months Ended 12 Months Ended
Oct. 11, 2017
USD ($)
Oct. 10, 2017
USD ($)
shares
Oct. 02, 2017
USD ($)
shares
Jul. 03, 2017
USD ($)
$ / shares
shares
Oct. 03, 2016
USD ($)
shares
Jul. 03, 2014
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Aug. 01, 2017
EUR (€)
Mar. 12, 2013
USD ($)
Mar. 12, 2013
EUR (€)
Debt Instrument [Line Items]                            
Conversion price adjusted     1.16%   1.24%                  
Debt conversion, bond par value   $ 400,000,000                        
Conversion features of the instruments value       $ 242,000,000   $ 121,000,000       $ 242,000,000        
Allocated debt issuance costs   340,000,000   1,000,000   1,000,000                
Debt Conversion,Cash redemption $ 60,000,000                          
Loss on financial instruments, net                 $ (1,000,000) (16,000,000)        
Unamortized debt discount and issuance costs totaled               $ 146,000,000            
Medium Term Credit Facilities [Member]                            
Debt Instrument [Line Items]                            
Unutilized committed medium term credit facilities               568,000,000            
Multi Currency Loan to Support our Industrial and R&D Programs [Member]                            
Debt Instrument [Line Items]                            
Line of credit outstanding amount | €                           € 350
Amount outstanding               118,000,000            
Line of credit amount withdrawn                         $ 471,000,000  
Multi Currency Loan to Support our Industrial and R&D Programs [Member] | Europe [Member]                            
Debt Instrument [Line Items]                            
Line of credit outstanding amount | €                     € 350      
Amount outstanding               55,000,000            
Line of credit amount withdrawn               $ 321,000,000     € 100      
Fair Value, Inputs, Level 3 [Member]                            
Debt Instrument [Line Items]                            
Fair value of liability component       1,266,000,000   878,000,000                
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                
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                
Senior unsecured convertible bonds conversion price | $ / shares       $ 20.54   $ 12                
Zero Coupon due 2019 (Tranche A) [Member]                            
Debt Instrument [Line Items]                            
Senior unsecured convertible bonds conversion premium rate           30.00%                
Debt conversion, bond par value             $ 600,000,000              
Conversion features of the instruments value           $ 0 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             13,000,000.0              
Zero Coupon due 2019 (Tranche A) [Member] | Measurement Input, Discount Rate [Member]                            
Debt Instrument [Line Items]                            
Debt discount rate           0.0240 0.0209              
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              
Loss on financial instruments, net                   5,000,000        
Zero Coupon due 2019 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]                            
Debt Instrument [Line Items]                            
Debt instrument principal amount           $ 600,000,000                
Long-term debt maturity date               2019            
Interest rate           0.00%                
Percentage at which bonds issued       101.265%                    
1.0% due 2021 (Tranche B) [Member]                            
Debt Instrument [Line Items]                            
Interest rate           1.00%                
Debt instrument periodic payment               semi-annually            
Senior unsecured convertible bonds conversion premium rate           31.00%                
Debt conversion, bond par value   60,000,000                        
Conversion features of the instruments value   0       $ 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] | Measurement Input, Discount Rate [Member]                            
Debt Instrument [Line Items]                            
Debt discount rate   0.0247       0.0322                
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                        
Loss on financial instruments, net                   $ 11,000,000        
1.0% due 2021 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member]                            
Debt Instrument [Line Items]                            
Debt instrument principal amount           $ 400,000,000                
Long-term debt maturity date               2021            
Interest rate           1.00%                
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]                            
Debt Conversion, Converted Instrument, Shares Issued | shares       9,737 16,366                  
Debt conversion, bond par value         $ 200,000                  
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] | Measurement Input, Discount Rate [Member]                            
Debt Instrument [Line Items]                            
Debt discount rate       0.0270                    
Zero-coupon, due 2022 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]                            
Debt Instrument [Line Items]                            
Debt instrument principal amount       $ 750,000,000                    
0.25%, due 2024 (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 2024 (Tranche B) [Member] | Measurement Input, Discount Rate [Member]                            
Debt Instrument [Line Items]                            
Debt discount rate       0.0328                    
0.25%, due 2024 (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%                    
Zero-coupon, due 2022 (Tranche A) [Member] | Measurement Input, Discount Rate [Member]                            
Debt Instrument [Line Items]                            
Debt discount rate       0.0270                    
Zero-coupon, due 2022 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]                            
Debt Instrument [Line Items]                            
Long-term debt maturity date               2022   2022        
Interest rate               0.00%     0.00%      
0.25% due 2024 (Tranche B) [Member]                            
Debt Instrument [Line Items]                            
Interest rate       0.25%                    
0.25% due 2024 (Tranche B) [Member] | Measurement Input, Discount Rate [Member]                            
Debt Instrument [Line Items]                            
Debt discount rate       0.0328                    
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%      
New Medium Term Credit Facility [Member] | Multi Currency Loan to Support our Industrial and R&D Programs [Member] | Europe [Member]                            
Debt Instrument [Line Items]                            
Line of credit outstanding amount               $ 533,000,000       € 500