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Future Benefit Payments for Pension Plans (Detail) - Pension Plans
$ in Millions
Dec. 31, 2017
USD ($)
U.S. Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 120
2019 83
2020 89
2021 93
2022 93
2023-2027 498
Non-U.S. Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 375
2019 375
2020 387
2021 409
2022 409
2023-2027 $ 2,196