Net Gains or Losses Recognized on Economic Exposures Associated With Foreign Currency Exchange Contracts (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	$ (241)	$ 1	$ (172)	$ (26)
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	239	(4)	159	20
Net gain (loss)	(2)	(3)	(13)	(6)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	64	(12)	52	28
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	(62)	11	(52)	(28)
Net gain (loss)	2	(1)	0	0
Income Taxes
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	8	0	(7)	15
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	(20)	(4)	(3)	(22)
Net gain (loss)	$ (12)	$ (4)	$ (10)	$ (7)