Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		$ (3,855)	$ (2,469)	$ (3,979)	$ (2,421)
Unrealized gains (losses) arising during the period		(57)	(130)	43	(154)
Reclassifications of realized net (gains) losses to net income		32	0	56	(24)
AOCI, Ending Balance		(3,880)	(2,599)	(3,880)	(2,599)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		15	10	26	13
Unrealized gains (losses) arising during the period		5	(1)	(6)	(4)
Reclassifications of realized net (gains) losses to net income		(4)	0	(4)	0
AOCI, Ending Balance		16	9	16	9
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		255	309	(25)	334
Unrealized gains (losses) arising during the period		(132)	(162)	192	(121)
Reclassifications of realized net (gains) losses to net income		(32)	(42)	(76)	(108)
AOCI, Ending Balance		91	105	91	105
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		(3,605)	(2,455)	(3,651)	(2,497)
Unrealized gains (losses) arising during the period		12	(2)	(10)	(2)
Reclassifications of realized net (gains) losses to net income		68	42	136	84
AOCI, Ending Balance		(3,525)	(2,415)	(3,525)	(2,415)
Foreign Currency Translation and Other(1)
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	[1]	(520)	(333)	(329)	(271)
Unrealized gains (losses) arising during the period	[1]	58	35	(133)	(27)
Reclassifications of realized net (gains) losses to net income	[1]	0	0	0	0
AOCI, Ending Balance	[1]	$ (462)	$ (298)	$ (462)	$ (298)

[1] Foreign Currency Translation and Other is net of an average 23% estimated tax at April 1, 2017 as the Company has not recognized deferred tax assets for some of our foreign entities.