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Benefit Plans - Expected Benefit Payments (Detail)
$ in Millions
Sep. 30, 2015
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 163
2017 164
2018 164
2019 177
2020 175
2021-2025 870
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2016 15
2017 15
2018 15
2019 15
2020 15
2021-2025 $ 67