Net Gains or Losses Recognized on Economic Exposures Associated With Foreign Currency Exchange Contracts (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ (233)	$ (89)
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	221	79
Net gains (losses)	(12)	(10)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	7	10
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(7)	(12)
Net gains (losses)	0	(2)
Income Taxes
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	23	23
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(31)	0
Net gains (losses)	$ (8)	$ 23