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Pensions And Other Postretirement Benefits Pensions and Other Postretirement Benefits (Amounts Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Millions
Sep. 29, 2018
Sep. 30, 2017
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial (gain) loss $ 0 $ 0
Prior service (credit) cost [1] (49) (73)
Total accumulated other comprehensive (income)/loss (49) (73)
Qualified Plan [Member] | Funded Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial (gain) loss (96) (94)
Prior service (credit) cost [1] 0 0
Total accumulated other comprehensive (income)/loss (96) (94)
Nonqualified Plan [Member] | Unfunded Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial (gain) loss 31 50
Prior service (credit) cost [1] 5 0
Total accumulated other comprehensive (income)/loss $ 36 $ 50
[1] The change in prior service credit is primarily attributed to the plan amendments to the other postretirement benefits as noted within the change in benefit obligation with remainder of the change being immaterial.