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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Retirement Benefits [Abstract]        
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 9 $ 1 $ 31 $ 54
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 12   $ 12