Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ (2,599)	$ (1,843)	$ (2,421)	$ (1,968)
Unrealized gains (losses) arising during the period	(106)	9	(260)	172
Reclassifications of net (gains) losses to net income	6	(70)	(18)	(108)
AOCI, Ending Balance	$ (2,699)	$ (1,904)	$ (2,699)	$ (1,904)
Estimated tax rate	37.00%	37.00%	37.00%	37.00%
Investments, net
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ 9	$ 30	$ 13	$ 100
Unrealized gains (losses) arising during the period	(7)	9	(11)	(31)
Reclassifications of net (gains) losses to net income	0	(20)	0	(50)
AOCI, Ending Balance	2	19	2	19
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	105	468	334	204
Unrealized gains (losses) arising during the period	(49)	(16)	(170)	343
Reclassifications of net (gains) losses to net income	(35)	(93)	(143)	(188)
AOCI, Ending Balance	21	359	21	359
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(2,415)	(2,118)	(2,497)	(2,196)
Unrealized gains (losses) arising during the period	(13)	0	(15)	(9)
Reclassifications of net (gains) losses to net income	41	43	125	130
AOCI, Ending Balance	(2,387)	(2,075)	(2,387)	(2,075)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(298)	(223)	(271)	(76)
Unrealized gains (losses) arising during the period	(37)	16	(64)	(131)
Reclassifications of net (gains) losses to net income	0	0	0	0
AOCI, Ending Balance	$ (335)	$ (207)	$ (335)	$ (207)