Pension and Other Postretirement Benefit Plans (Narrative) (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Sep. 28, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 2		$ 0	$ 12	$ 12
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 6	$ (110)	$ 0	$ 112	$ (19)
Qualified Plan [Member] | Defined Benefit Plan, Funded Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount						$ 1,400