Income Taxes - Recon between U.S. Federal Taxes and Statutory Rate (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Reconciliation between U.S. federal income taxes at the statutory rate and income tax expense (benefit) on continuing operations
Notional U.S. federal income tax expense at the statutory rate		$ 406	$ 551	$ 602
U.S. state income tax benefit, net		(5)	(7)	(4)
Tax law changes		15	638	7
Tax credits		(22)	(8)	(8)
Non-U.S. net earnings		(166)	(213)	(355)
Change in accrued income tax liabilities		(61)	13	24
Valuation allowance		(163)	33	(1)
Legal entity restructuring and intercompany transactions		3	(1,329)	(40)
Excess tax benefits from share-based payments		(8)	(24)	(40)
Other		(14)	2	(5)
Income tax expense (benefit)		$ (15)	$ (344)	$ 180
U.S. federal statutory rate	21.00%	21.00%	24.58%	35.00%