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Pensions And Other Postretirement Benefits (Amounts Recognized In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Sep. 28, 2019
Sep. 29, 2018
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets $ 0 $ 0
Other current liabilities (3) (3)
Other liabilities (74) (25)
Total assets (liabilities) (77) (28)
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets (16) (61)
Other current liabilities 0 (3)
Other liabilities (17) 0
Total assets (liabilities) (1) 58
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Other current liabilities (12) (12)
Other liabilities (227) (208)
Total assets (liabilities) $ (239) $ (220)