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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, 2021
USD ($)
Bond
shares
Jul. 31, 2020
USD ($)
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2017
Jun. 01, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Aug. 01, 2017
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         $ (43,000,000) (26,000,000)        
Allocated debt deferred tax effect 30,000,000                  
Unamortized debt discount and issuance costs totaled         113,000,000          
Medium Term Credit Facilities [Member]                    
Debt Instrument [Line Items]                    
Unutilized committed medium term credit facilities         910,000,000          
Support R&D and Capital Expenditure Programs [Member] | Italy and France [Member]                    
Debt Instrument [Line Items]                    
Increase in long term debt | €                 € 500 € 500
Amount outstanding         566,000,000 424,000,000        
New Facility Agreement with CDP [Member]                    
Debt Instrument [Line Items]                    
Increase in long term debt | €               € 150    
Amount outstanding         $ 156,000,000          
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]                    
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] | Senior Unsecured Convertible Bonds [Member]                    
Debt Instrument [Line Items]                    
Long-term debt maturity date             2022      
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] | Senior Unsecured Convertible Bonds [Member]                    
Debt Instrument [Line Items]                    
Long-term debt maturity date         2024 2024        
Interest rate         0.25% 0.25%     0.25%  
Zero Coupon Due Two Thousand And Twenty Four Tranche B                    
Debt Instrument [Line Items]                    
Debt conversion, bond par value     $ 248,000,000              
Conversion features of the instruments value     $ 0              
Number of bonds settled | Bond     3,750              
Number of bonds settled on net-share basis | Bond     1,238              
Total consideration of bonds on net-share basis     $ 479,000,000              
Number of bonds settled on full cash basis | Bond     2,512              
Total consideration of bonds on full cash basis     $ 1,015,000,000              
Write-off of unamortized debt issuance costs         $ 1,000,000          
Zero Coupon Due Two Thousand And Twenty Four Tranche B | Treasury Stock [Member]                    
Debt Instrument [Line Items]                    
Debt Conversion, Converted Instrument, Shares Issued | shares     5,800,000              
Zero Coupon Due Two Thousand And Twenty Four Tranche B | Fair Value, Inputs, Level 3 [Member]                    
Debt Instrument [Line Items]                    
Fair value of liability component     $ 689,000,000              
Loss on financial instruments, net         $ 44,000,000          
Zero Coupon Due Two Thousand And Twenty Four Tranche B | Measurement Input, Discount Rate [Member]                    
Debt Instrument [Line Items]                    
Debt discount rate     0.011              
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 2025        
Percentage at which bonds issued 105.80%                  
Interest rate         0.00% 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 2027        
Percentage at which bonds issued 104.50%                  
Interest rate         0.00% 0.00%     0.00%