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Long-Term Debt - Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total long-term debt $ 2,539 $ 2,621
Less current portion (143) (795)
Total long-term debt, less current portion 2,396 1,826
0.73% due 2021, floating interest rate at Libor + 0.525% [Member]    
Debt Instrument [Line Items]    
Funding program loans from European Investment Bank ("EIB")   30
0.75% due 2021, floating interest rate at Libor + 0.572% [Member]    
Debt Instrument [Line Items]    
Funding program loans from European Investment Bank ("EIB")   29
0.06% due 2028, floating interest rate at Euribor + 0.589% [Member]    
Debt Instrument [Line Items]    
Funding program loans from European Investment Bank ("EIB") 202 250
0.05% due 2029, floating interest rate at Euribor + 0.564% [Member]    
Debt Instrument [Line Items]    
Funding program loans from European Investment Bank ("EIB") 222 270
0.15% due 2031, floating interest rate at Euribor + 0.660% [Member]    
Debt Instrument [Line Items]    
Funding program loans from European Investment Bank ("EIB") 187  
0.06% due 2031, floating interest rate at Euribor + 0.583% [Member]    
Debt Instrument [Line Items]    
Funding program loans from European Investment Bank ("EIB") 379  
0.15% due 2027, floating interest rate at Euribor + 0.690% [Member] | Cassa Depositi e Prestiti SpA ("CDP") [Member]    
Debt Instrument [Line Items]    
Credit Facility 156  
0.25% due 2024 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member]    
Debt Instrument [Line Items]    
Senior unsecured convertible bonds   674
Zero-coupon, due 2025 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member]    
Debt Instrument [Line Items]    
Senior unsecured convertible bonds 713 703
Zero-coupon, due 2027 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member]    
Debt Instrument [Line Items]    
Senior unsecured convertible bonds 674 661
0.37% (weighted average), due 2021-2028, fixed interest rate [Member]    
Debt Instrument [Line Items]    
Other Loans Payable $ 6 $ 4