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Benefit Plans - Expected Benefit Payments (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 173
2019 158
2020 159
2021 163
2022 165
2023-2027 859
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 14
2019 14
2020 14
2021 13
2022 13
2023-2027 $ 56