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Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term debt | $ 1,910 | $ 1,701
Less current portion | (146) | (118)
Total long-term debt, less current portion | 1,764 | 1,583
3.57% due 2020, floating interest rate at Libor + 1.099% [Member] |  |
Debt Instrument [Line Items] |  |
Funding program loans from European Investment Bank | 25 | 38
3.69% due 2020, floating interest rate at Libor + 1.056% [Member] |  |
Debt Instrument [Line Items] |  |
Funding program loans from European Investment Bank | 55 | 83
0.50% due 2020, floating interest rate at Euribor + 0.817% [Member] |  |
Debt Instrument [Line Items] |  |
Funding program loans from European Investment Bank | 29 | 45
3.30% due 2021, floating interest rate at Libor + 0.525% [Member] |  |
Debt Instrument [Line Items] |  |
Funding program loans from European Investment Bank | 90 | 120
3.46% due 2021, floating interest rate at Libor + 0.572% [Member] |  |
Debt Instrument [Line Items] |  |
Funding program loans from European Investment Bank | 86 | 115
0.32% due 2028, floating interest rate at Libor 0.589% [Member] |  |
Debt Instrument [Line Items] |  |
Funding program loans from European Investment Bank | 292 |
Zero-coupon, due 2022 (Tranche A) [Member] | Senior Unsecured Convertible Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Senior unsecured convertible bonds | 681 | 662
0.25%, due 2024 (Tranche B) [Member] | Senior Unsecured Convertible Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Senior unsecured convertible bonds | 635 | 616
0.31% (weighted average), due 2018-2023, fixed interest rate [Member] |  |
Debt Instrument [Line Items] |  |
Other Loans Payable | 16 | 20
0.41% (weighted average), due 2018, fixed interest rate [Member] |  |
Debt Instrument [Line Items] |  |
Other Loans Payable |  | 1
0.87% (weighted average), due 2020, fixed interest rate [Member] |  |
Debt Instrument [Line Items] |  |
Other Loans Payable | $ 1 | $ 1

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