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Post-Employment and Other Long-Term Employees Benefits - Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 32
2019 31
2020 26
2021 36
2022 35
From 2023 to 2026 264
Other Long-Term Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 4
2019 5
2020 8
2021 3
2022 4
From 2023 to 2026 $ 30