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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 1 $ 3