Equity Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ (1,187)	$ (3,266)
Unrealized gains (losses) arising during the period	65	65
Reclassifications of net (gains) losses to net income	(22)	73
AOCI, Ending Balance	(1,144)	(3,128)
Estimated tax rate	37.00%	37.00%
Investments, net
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	95	3
Unrealized gains (losses) arising during the period	18	17
Reclassifications of net (gains) losses to net income	(37)	0
AOCI, Ending Balance	76	20
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	83	(52)
Unrealized gains (losses) arising during the period	41	65
Reclassifications of net (gains) losses to net income	(10)	(6)
AOCI, Ending Balance	114	7
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(1,271)	(3,234)
Unrealized gains (losses) arising during the period	0	0
Reclassifications of net (gains) losses to net income	25	73
AOCI, Ending Balance	(1,246)	(3,161)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(94)	17
Unrealized gains (losses) arising during the period	6	(17)
Reclassifications of net (gains) losses to net income	0	6
AOCI, Ending Balance	$ (88)	$ 6