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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
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 1 $ 1 $ 1
Interest cost 1 1 3
Expected return on plan assets 0 0 0
Amortization of prior service cost (25) (25) (20)
Recognized actuarial loss (gain), net (5) (1) (15)
Recognized settlement loss (gain) 0 0 0
Net periodic benefit (credit) cost (28) (24) (31)
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 2 8
Interest cost 55 57 65
Expected return on plan assets (62) (59) (65)
Amortization of prior service cost 1 0 0
Recognized actuarial loss (gain), net 0 1 2
Recognized settlement loss (gain) 0 2 (12)
Net periodic benefit (credit) cost (6) 3 (2)
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 7 11 6
Interest cost 8 8 9
Expected return on plan assets 0 0 0
Amortization of prior service cost 1 0 0
Recognized actuarial loss (gain), net 3 6 5
Recognized settlement loss (gain) 0 0 0
Net periodic benefit (credit) cost $ 19 $ 25 $ 20