Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Dec. 29, 2017	Jun. 28, 2019	Jun. 29, 2018	Sep. 28, 2018
Income tax expense (benefit)	$ (245)	$ 77		$ (76)	$ 784
Income tax benefit related to tax impacts of Swiss Tax Reform	(214)			(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
Income tax expense related to tax impacts of the Tax Cuts and Jobs Act			$ 567		567
Net income tax benefit related to certain legal entity restructurings					61
Income tax benefit resulting from lapses of statutes of limitations		$ 17			$ 34
U.S. federal corporate income tax rate			21.00%
Income tax benefit related to the reduction in the valuation allowance recorded against certain U.S. federal tax credit carryforwards			$ 34
Accrued interest and penalties related to uncertain tax positions	40			40		$ 60
Income tax benefit related to interest and penalties				17
Unrecognized income tax benefits, approximate amount that could be resolved in next twelve months	$ 100			100
Expected income tax expense related to cantonal enactment of Swiss Tax Reform				$ 300
Liabilities sharing percent, entity				31.00%
Liabilities sharing percent, Tyco International				27.00%
Liabilities sharing percent, Covidien				42.00%