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Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Oct. 01, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Unrealized net hedging gain (loss) $ (2) $ (2)
Unrealized net gain (loss) on investments 0 1
Currency translation adjustment (53) (59)
Postretirement benefits reserve adjustments 71 15
Total accumulated other comprehensive loss $ 16 $ (45)