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Long-Term Debt - Additional Information (Detail)
$ / shares in Units, € in Millions
1 Months Ended 12 Months Ended
Aug. 04, 2020
USD ($)
$ / shares
shares
Jul. 03, 2017
USD ($)
$ / shares
shares
Jul. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Feb. 24, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Aug. 01, 2017
EUR (€)
Mar. 12, 2013
USD ($)
Mar. 12, 2013
EUR (€)
Debt Instrument [Line Items]                      
Conversion features of the instruments value $ 215,000,000 $ 242,000,000   $ 184,000,000              
Allocated debt issuance costs 1,000,000 1,000,000                  
Loss on financial instruments, net       (26,000,000) $ (1,000,000)            
Allocated debt deferred tax effect 30,000,000                    
Unamortized debt discount and issuance costs totaled       212,000,000              
Medium Term Credit Facilities [Member]                      
Debt Instrument [Line Items]                      
Unutilized committed medium term credit facilities       1,200,000,000              
Multi Currency Loan to Support our Industrial and R&D Programs [Member]                      
Debt Instrument [Line Items]                      
Amount outstanding       59,000,000              
Line of credit amount withdrawn                   $ 471,000,000  
Line of credit outstanding amount | €                     € 350
Multi Currency Loan to Support our Industrial and R&D Programs [Member] | Europe [Member]                      
Debt Instrument [Line Items]                      
Line of credit amount withdrawn       321,000,000       € 100      
Line of credit outstanding amount       520,000,000       € 350 € 500    
Fair Value, Inputs, Level 3 [Member]                      
Debt Instrument [Line Items]                      
Fair value of liability component 1,362,000,000 1,266,000,000                  
Senior Unsecured Convertible Bonds [Member]                      
Debt Instrument [Line Items]                      
Debt instrument principal amount       750,000,000              
Net proceeds from issuance of senior unsecured convertible bonds 1,567,000,000 $ 1,502,000,000                  
Zero-coupon, due 2022 (Tranche A) [Member]                      
Debt Instrument [Line Items]                      
Senior unsecured convertible bonds conversion premium rate   37.50%                  
Debt conversion, bond par value     $ 750,000,000                
Conversion features of the instruments value     $ 0                
Zero-coupon, due 2022 (Tranche A) [Member] | Treasury Stock [Member]                      
Debt Instrument [Line Items]                      
Debt Conversion, Converted Instrument, Shares Issued | shares     11,400,000                
Zero-coupon, due 2022 (Tranche A) [Member] | Fair Value, Inputs, Level 3 [Member]                      
Debt Instrument [Line Items]                      
Fair value of liability component     $ 739,000,000                
Loss on financial instruments, net       $ 25,000,000              
Zero-coupon, due 2022 (Tranche A) [Member] | Measurement Input, Discount Rate [Member]                      
Debt Instrument [Line Items]                      
Debt discount rate   0.0270 0.008                
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%                  
Dual Tranche Senior Unsecured Convertible Bonds | Senior Unsecured Convertible Bonds [Member]                      
Debt Instrument [Line Items]                      
Debt instrument principal amount $ 1,500,000,000 $ 1,500,000,000                  
Senior unsecured convertible bonds conversion price | $ / shares   $ 20.54                  
Zero-coupon, due 2022 (Tranche A) [Member] | Measurement Input, Discount Rate [Member]                      
Debt Instrument [Line Items]                      
Debt discount rate 0.0130                    
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%      
Zero Coupon Due Two Thousand Nineteen Tranche A | Senior Unsecured Convertible Bonds [Member]                      
Debt Instrument [Line Items]                      
Percentage at which bonds issued   101.265%                  
Tranche Two                      
Debt Instrument [Line Items]                      
Debt Conversion, Converted Instrument, Shares Issued | shares   9,737                  
Tranche One                      
Debt Instrument [Line Items]                      
Debt Conversion, Converted Instrument, Shares Issued | shares   9,737                  
Debt conversion, bond par value   $ 200,000                  
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 0.0185                    
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%      
Zero-coupon, due 2025 (Tranche A) [Member]                      
Debt Instrument [Line Items]                      
Senior unsecured convertible bonds conversion premium rate 47.50%                    
Debt Conversion, Converted Instrument, Shares Issued | shares 4,585                    
Debt conversion, bond par value $ 200,000                    
Zero-coupon, due 2025 (Tranche A) [Member] | Measurement Input, Discount Rate [Member]                      
Debt Instrument [Line Items]                      
Debt discount rate 0.0130                    
Zero-coupon, due 2025 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]                      
Debt Instrument [Line Items]                      
Debt instrument principal amount $ 750,000,000                    
Long-term debt maturity date       2025              
Percentage at which bonds issued 105.80%                    
Interest rate       0.00%       0.00%      
Senior unsecured convertible bonds conversion price | $ / shares $ 43.62                    
Zero-coupon, due 2027 (Tranche B) [Member]                      
Debt Instrument [Line Items]                      
Senior unsecured convertible bonds conversion price | $ / shares $ 45.10                    
Senior unsecured convertible bonds conversion premium rate 52.50%                    
Debt Conversion, Converted Instrument, Shares Issued | shares 4,435                    
Debt conversion, bond par value $ 200,000                    
Zero-coupon, due 2027 (Tranche B) [Member] | Measurement Input, Discount Rate [Member]                      
Debt Instrument [Line Items]                      
Debt discount rate 0.0185                    
Zero-coupon, due 2027 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member]                      
Debt Instrument [Line Items]                      
Debt instrument principal amount $ 750,000,000                    
Long-term debt maturity date       2027              
Percentage at which bonds issued 104.50%                    
Interest rate       0.00%       0.00%      
New Medium Term Credit Facility [Member] | Medium Term Credit Facilities [Member]                      
Debt Instrument [Line Items]                      
Unutilized committed medium term credit facilities | €               € 500      
Amount outstanding | €               € 500      
New Medium Term Credit Facility [Member] | Medium Term Credit Facilities [Member] | Subsequent Event [Member]                      
Debt Instrument [Line Items]                      
Line of credit amount withdrawn | €             € 335