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Employee Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 12
2020 11
2021 10
2022 10
2023 10
2024 - 2028 48
Pension Benefits [Member] | Foreign Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 14
2020 13
2021 17
2022 15
2023 15
2024 - 2028 88
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 3
2020 3
2021 3
2022 3
2023 3
2024 - 2028 11
Postretirement Benefits [Member] | Foreign Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 1
2020 1
2021 1
2022 1
2023 1
2024 - 2028 $ 4