Interest Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Oct. 02, 2021
Interest expense	$ (1,973)	$ (1,549)	$ (1,546)
Interest and investment income	424	90	307
Net periodic pension and postretirement benefit costs (other than service costs)	340	62	(167)
Interest expense, net	$ (1,209)	$ (1,397)	$ (1,406)