Equity Details about AOCI Components Reclassified to Net Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Details about AOCI Components Reclassified to Net Income
Interest income/(expense), net	$ 49	$ (72)
Primarily revenue	12,309	11,341
Other income/(expense), net	6	(102)
Income taxes	1,036	590
Net income	1,840	1,382
Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Net income	22	(73)
Gain/(loss) in net income from Investments, net | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Interest income/(expense), net	59	0
Income taxes	(22)	0
Net income	37	0
Gain/(loss) in net income from Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Primarily revenue	16	10
Income taxes	(6)	(4)
Net income	10	6
Gain/(loss) in net income from Pension and postretirement medical expense | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Primarily included in the computation of net periodic benefit cost	(40)	(116)
Income taxes	15	43
Net income	(25)	(73)
Gain/(loss) in net income from Foreign currency translation and other | Reclassification out of Accumulated Other Comprehensive Income [Member]
Details about AOCI Components Reclassified to Net Income
Other income/(expense), net	0	(10)
Income taxes	0	4
Net income	$ 0	$ (6)