Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 02, 2016	Dec. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ (2,421)	$ (1,968)
Unrealized gains (losses) arising during the period	(24)	85
Reclassifications of net (gains) losses to net income	(24)	3
AOCI, Ending Balance	$ (2,469)	$ (1,880)
Estimated tax rate	37.00%	37.00%
Investments, net
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ 13	$ 100
Unrealized gains (losses) arising during the period	(3)	(16)
Reclassifications of net (gains) losses to net income	0	0
AOCI, Ending Balance	10	84
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	334	204
Unrealized gains (losses) arising during the period	41	176
Reclassifications of net (gains) losses to net income	(66)	(41)
AOCI, Ending Balance	309	339
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(2,497)	(2,196)
Unrealized gains (losses) arising during the period	0	0
Reclassifications of net (gains) losses to net income	42	44
AOCI, Ending Balance	(2,455)	(2,152)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(271)	(76)
Unrealized gains (losses) arising during the period	(62)	(75)
Reclassifications of net (gains) losses to net income	0	0
AOCI, Ending Balance	$ (333)	$ (151)