Equity Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ (1,206)	$ (2,968)	$ (1,187)	$ (3,266)
Unrealized gains (losses) arising during the period	24	34	82	202
Reclassifications of net (gains) losses to net income	13	50	(64)	180
AOCI, Ending Balance	(1,169)	(2,884)	(1,169)	(2,884)
Estimated tax rate	37.00%	37.00%
Investments, net
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	40	25	95	3
Unrealized gains (losses) arising during the period	29	43	69	72
Reclassifications of net (gains) losses to net income	(1)	0	(96)	(7)
AOCI, Ending Balance	68	68	68	68
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	50	118	83	(52)
Unrealized gains (losses) arising during the period	(24)	60	(26)	245
Reclassifications of net (gains) losses to net income	(10)	(25)	(41)	(40)
AOCI, Ending Balance	16	153	16	153
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(1,207)	(3,094)	(1,271)	(3,234)
Unrealized gains (losses) arising during the period	0	0	15	(6)
Reclassifications of net (gains) losses to net income	24	75	73	221
AOCI, Ending Balance	(1,183)	(3,019)	(1,183)	(3,019)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(89)	(17)	(94)	17
Unrealized gains (losses) arising during the period	19	(69)	24	(109)
Reclassifications of net (gains) losses to net income	0	0	0	6
AOCI, Ending Balance	$ (70)	$ (86)	$ (70)	$ (86)