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Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Aug. 04, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 2,621 |  | $ 2,072
Less current portion | (795) |  | (173)
Total long-term debt, less current portion | 1,826 |  | 1,899
Senior Unsecured Convertible Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured convertible bonds |  | $ 1,500 |
1.36% due 2020, floating interest rate at Libor + 1.099% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Funding program loans from European Investment Bank |  |  | 13
1.20% due 2020, floating interest rate at Libor + 0.956% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Funding program loans from European Investment Bank |  |  | 28
0.37% due 2020, floating interest rate at Euribor + 0.817% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Funding program loans from European Investment Bank |  |  | 14
0.77% due 2021, floating interest rate at Libor + 0.525% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Funding program loans from European Investment Bank | 30 |  | 60
0.83% due 2021, floating interest rate at Libor + 0.572% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Funding program loans from European Investment Bank | 29 |  | 58
0.09% due 2028, floating interest rate at Euribor + 0.589% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Funding program loans from European Investment Bank | 250 |  | 258
0.22% due 2029, floating interest rate at Euribor + 0.564% [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Funding program loans from European Investment Bank | 270 |  | 275
Zero-coupon, due 2022 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured convertible bonds |  |  | 700
0.25% due 2024 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured convertible bonds | 674 |  | 654
Zero-coupon, due 2025 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured convertible bonds | 703 |  |
Zero-coupon, due 2027 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured convertible bonds | 661 |  |
0.48% (weighted average), due 2021-2028, fixed interest rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Other Loans Payable | $ 4 |  | $ 12

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