Pensions And Other Postretirement Benefits Pensions and Other Postretirement Benefits (Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Millions	Oct. 03, 2020	Sep. 28, 2019
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ 24	$ 27
Prior service (credit) cost	(37)	(42)
Total accumulated other comprehensive (income)/loss	(13)	(15)
Qualified Plan [Member] | Defined Benefit Plan, Funded Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	4	(53)
Prior service (credit) cost	0	0
Total accumulated other comprehensive (income)/loss	4	(53)
Nonqualified Plan [Member] | Defined Benefit Plan, Unfunded Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	45	46
Prior service (credit) cost	3	4
Total accumulated other comprehensive (income)/loss	$ 48	$ 50