Cash, Cash Equivalents, Restricted Cash and Borrowings Interest Expense, net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Interest expense	$ (198)	$ (172)	$ (361)	$ (318)
Interest and investment income	30	29	105	46
Net periodic pension and postretirement benefit costs other than service costs	25	0	50	0
Interest expense, net	$ (143)	$ (143)	$ (206)	$ (272)