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Employee Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Sep. 30, 2016
USD ($)
U.S. Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2017 $ 13
2018 11
2019 11
2020 11
2021 11
2022-2026 52
Foreign Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2017 12
2018 13
2019 12
2020 12
2021 14
2022-2026 80
U. S. Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2017 4
2018 3
2019 3
2020 3
2021 3
2022-2026 13
Foreign Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 1
2019 1
2020 1
2021 1
2022-2026 $ 4