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Future Benefit Payments for Postretirement Health Care Plans (Detail) - Postretirement Benefit Plans
$ in Millions
Dec. 31, 2017
USD ($)
U.S. Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 11
2019 12
2020 13
2021 15
2022 16
2023-2027 85
Non-U.S. Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 5
2019 5
2020 6
2021 6
2022 6
2023-2027 $ 55