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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - Pension Plan [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Plan Assets, Payment for Settlement     $ 4 $ 5
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 8 $ 13 13 $ 22
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 43   $ 43