Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Income Taxes
Income tax (expense) benefit	$ (185)	$ 245	$ (674)	$ 76
Income tax benefit related to pre-separation tax matters and termination of the tax sharing agreement			31
Income tax expense related to the increase in the valuation allowance recorded against certain non-U.S. deferred tax assists	170		170
Goodwill impairment			900
Goodwill impairment tax benefit			4
Income tax (expense) benefit related to tax impacts of Swiss Tax Reform		214	(355)	214
Income tax benefit related to a tax settlement in a non-U.S. jurisdictions		$ 93		93
Income tax expense associated with certain legal entity restructurings and intercompany transactions				$ 15
Unrecognized income tax benefits, approximate amount that could be resolved in next twelve months	$ 50		50
Net other income related to pre-separation tax matters and the termination of the tax sharing agreement			$ 8