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Supplemental Cash Flow Information (Cash Payments For Interest And Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Supplemental Cash Flow Information [Abstract]      
Interest, net of amounts capitalized $ 368 $ 249 $ 242
Income taxes, net of refunds $ 470 $ 779 $ 686