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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Sep. 28, 2019
Income Tax Disclosure [Abstract]          
Effective tax rate for continuing operations 21.00% 6.00% 22.70% 15.40%  
Unrecognized tax benefits $ 161   $ 161   $ 169