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Pensions And Other Postretirement Benefits (Amounts Recognized In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Oct. 01, 2016
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets $ 0 $ 0
Other current liabilities (3) (4)
Other liabilities (30) (32)
Total assets (liabilities) (33) (36)
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Other current liabilities (11) (9)
Other liabilities (219) (213)
Total assets (liabilities) (230) (222)
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other assets (44) 0
Other current liabilities 0 0
Other liabilities (9) (114)
Total assets (liabilities) $ 35 $ (114)