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Pensions And Other Postretirement Benefits (Estimated Future Benefit Payments Expected To Be Paid) (Details)
$ in Millions
3 Months Ended
Dec. 29, 2018
plan
Apr. 01, 2017
plan
Sep. 29, 2018
USD ($)
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
2019     $ 3
2020     3
2021     3
2022     3
2023     2
2024-2028     11
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Number of Plans Subject to Settlement | plan   2  
2019     122
2020     79
2021     80
2022     81
2023     82
2024-2028     417
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
2019     12
2020     12
2021     13
2022     13
2023     14
2024-2028     $ 69
Subsequent Event [Member] | Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Number of Plans Subject to Settlement | plan 3