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Pensions And Other Postretirement Benefits (Components Of Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans Recognized In The Consolidated Statements Of Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2 $ 2 $ 1
Interest cost 1 1 1
Expected return on plan assets 0 0 0
Amortization of prior service cost (6) (2) (25)
Recognized actuarial loss (gain), net 4 5 (5)
Recognized settlement loss (gain) 0 0 0
Net periodic benefit (credit) cost 1 6 (28)
Defined Benefit Plan, Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 14 56 55
Expected return on plan assets (17) (57) (62)
Amortization of prior service cost 0 0 1
Recognized actuarial loss (gain), net 0 (1) 0
Recognized settlement loss (gain) (112) 19 0
Net periodic benefit (credit) cost (115) 17 (6)
Defined Benefit Plan, Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 1 7
Interest cost 8 9 8
Expected return on plan assets 0 0 0
Amortization of prior service cost 1 1 1
Recognized actuarial loss (gain), net 3 2 3
Recognized settlement loss (gain) 0 0 0
Net periodic benefit (credit) cost $ 12 $ 13 $ 19