Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2020	Mar. 29, 2019	Mar. 27, 2020	Mar. 29, 2019
Income Taxes
Income tax expense	$ 42	$ 91	$ 489	$ 169
Income tax benefit related to pre-separation tax matters and termination of the tax sharing agreement	31		31
Goodwill impairment	900		900
Goodwill impairment tax benefit	4
Income tax expense related to tax impacts of Swiss Tax Reform			355
Income tax expense associated with certain legal entity restructurings and intercompany transactions		15		$ 15
Income tax benefit resulting from lapses of statutes of limitations		$ 12
Unrecognized income tax benefits, approximate amount that could be resolved in next twelve months	100		$ 100
Net other income related to pre-separation tax matters and the termination of the tax sharing agreement	$ 8