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Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Other Comprehensive Income Loss [Line Items]        
Total Other Comprehensive Income (Loss), Before Tax $ 4 $ 7 $ 5 $ (7)
Total Other Comprehensive Income (Loss), Tax (2) 2 (1) 1
Total Other Comprehensive Income (Loss), Net of Taxes 2 9 4 (6)
Derivatives accounted for as cash flow hedges:        
Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 2 (1) 0 0
Other Comprehensive Income (Loss), Before Reclassifications, Tax (1) 0 0 0
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 1 (1) 0 0
Derivatives accounted for as cash flow hedges: | Cost of Sales        
Other Comprehensive Income Loss [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Before Tax 2 (3) 3 1
Reclassification from AOCI, Current Period, Tax 0 1 (1) (1)
Reclassification from Accumulated Other Comprehensive Income, Net of Tax 2 (2) 2 0
Investments:        
Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 1 1 0 0
Other Comprehensive Income (Loss), Before Reclassifications, Tax (1) 0 0 0
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 0 1 0 0
Currency translation:        
Other Comprehensive Income Loss [Line Items]        
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax 5 9 6 (5)
Other Comprehensive Income (Loss), Before Reclassifications, Tax 0 0 0 0
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax 5 9 6 (5)
Postretirement benefits        
Other Comprehensive Income Loss [Line Items]        
Total Other Comprehensive Income (Loss), Before Tax (6) 1 (4) (3)
Total Other Comprehensive Income (Loss), Tax 0 1 0 2
Total Other Comprehensive Income (Loss), Net of Taxes $ (6) $ 2 $ (4) $ (1)