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Pensions And Other Postretirement Benefits (Estimated Future Benefit Payments Expected To Be Paid) (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 3
2019 3
2020 3
2021 3
2022 3
2023-2027 13
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 11
2019 11
2020 12
2021 12
2022 13
2023-2027 68
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 82
2019 83
2020 83
2021 84
2022 85
2023-2027 $ 431