Net Gains or Losses Recognized on Economic Exposures Associated With Foreign Currency Exchange Contracts (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	$ (27)	$ 17
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	24	(14)
Net gain (loss)	(3)	3
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	40	3
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	(39)	(1)
Net gain (loss)	1	2
Income Taxes
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency denominated assets and liabilities	15	3
Net gain (loss) on foreign exchange risk management contracts not designated as hedges	(18)	(1)
Net gain (loss)	$ (3)	$ 2