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Long-term Employee-related Obligations - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Long-term investments earmarked for severance pay liabilities in Israel $ 137 $ 149
Expected contributions to pension funds 106  
2019 6  
2020 6  
2021 7  
2022 8  
2023 8  
2024 to 2028 $ 42