Net Gains or Losses Recognized on Economic Exposures Associated With Foreign Currency Exchange Contracts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	$ 80	$ 13	$ (92)	$ (13)
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	(103)	(25)	56	(5)
Net gain (loss)	(23)	(12)	(36)	(18)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	(26)	(25)	26	3
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	25	23	(27)	(5)
Net gain (loss)	(1)	(2)	(1)	(2)
Income Taxes
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	(4)	(1)	(11)	14
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	8	(6)	5	(28)
Net gain (loss)	$ 4	$ (7)	$ (6)	$ (14)