Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		$ (3,880)	$ (2,599)	$ (3,979)	$ (2,421)
Unrealized gains (losses) arising during the period		(26)	(106)	17	(260)
Reclassifications of realized net (gains) losses to net income		42	6	98	(18)
AOCI, Ending Balance		(3,864)	(2,699)	(3,864)	(2,699)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		16	9	26	13
Unrealized gains (losses) arising during the period		(5)	(7)	(11)	(11)
Reclassifications of realized net (gains) losses to net income		0	0	(4)	0
AOCI, Ending Balance		11	2	11	2
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		91	105	(25)	334
Unrealized gains (losses) arising during the period		(66)	(49)	126	(170)
Reclassifications of realized net (gains) losses to net income		(26)	(35)	(102)	(143)
AOCI, Ending Balance		(1)	21	(1)	21
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		(3,525)	(2,415)	(3,651)	(2,497)
Unrealized gains (losses) arising during the period		0	(13)	(10)	(15)
Reclassifications of realized net (gains) losses to net income		68	41	204	125
AOCI, Ending Balance		(3,457)	(2,387)	(3,457)	(2,387)
Foreign Currency Translation and Other(1)
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	[1]	(462)	(298)	(329)	(271)
Unrealized gains (losses) arising during the period	[1]	45	(37)	(88)	(64)
Reclassifications of realized net (gains) losses to net income	[1]	0	0	0	0
AOCI, Ending Balance	[1]	$ (417)	$ (335)	$ (417)	$ (335)

[1] Foreign Currency Translation and Other is net of an average 24% estimated tax at July 1, 2017 as the Company has not recognized deferred tax assets for some of our foreign entities.