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Pensions And Other Postretirement Benefits (Amounts Recognized In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Sep. 29, 2018
Sep. 30, 2017
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets $ 0 $ 0
Other current liabilities (3) (3)
Other liabilities (25) (30)
Total assets (liabilities) (28) (33)
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets (61) (44)
Other current liabilities (3) 0
Other liabilities 0 (9)
Total assets (liabilities) 58 35
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Other current liabilities (12) (11)
Other liabilities (208) (219)
Total assets (liabilities) $ (220) $ (230)