Equity Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 30, 2013		Mar. 31, 2012		Mar. 30, 2013		Mar. 31, 2012
Changes in Accumulated Other Comprehensive Loss, Net of Tax [Abstract]
Estimated tax rate	37.00%		37.00%		37.00%		37.00%
Accumulated Other Comprehensive Income [Roll Forward]
Market Value Adjustments, Investments, Beginning Balance	$ 20		$ 8		$ 3		$ 6
Market Value Adjustments, Cash Flow Hedges, Beginning Balance	7		(24)		(52)		(54)
Unrecognized Pension and Post-retirement Medical Expense, Beginning Balance	(3,161)		(2,570)		(3,234)		(2,625)
Foreign Currency Translation and Other, Beginning Balance	6		12		17		43
AOCI, Beginning Balance	(3,128)		(2,574)		(3,266)		(2,630)
Unrealized gains (losses) arising during the period, Investments	12		18		29		20
Unrealized gain (losses) arising during the period, Cash Flow Hedges	120		11		185		39
Unrealized gains (losses) arising during the period, Pension and Post-retirement Medical Expense	(6)		(22)		(6)		(22)
Unrealized gains (losses) arising during the period, Foreign Currency Translation and Other	(23)		2		(40)		(29)
Unrealized gains (losses) arising during the period, AOCI	103		9		168		8
Reclassifications of net (gains) losses to net income, Investments	(7)		(6)		(7)		(6)
Reclassifications of net (gains) losses to net income, Cash Flow Hedges	(9)	[1]	1	[1]	(15)	[1]	3	[1]
Reclassifications of net (gains) losses to net income, Unrecognized Pension and Post-retirement Medical Expense	73		55		146		110
Reclassifications of net (gains) losses to net income, Foreign Currency Translation and Other	0		34		6		34
Reclassifications of net (gains) losses to net income, AOCI	57		84		130		141
Market Value Adjustments, Investments, Ending Balance	25		20		25		20
Market Value Adjustments, Cash Flow Hedges, Ending Balance	118		(12)		118		(12)
Unrecognized Pension and Post-retirement Medical Expense, Ending Balance	(3,094)		(2,537)		(3,094)		(2,537)
Foreign Currency Translation and Other, Ending Balance	(17)		48		(17)		48
AOCI, Ending Balance	$ (2,968)		$ (2,481)		$ (2,968)		$ (2,481)

[1] Reclassifications of gains on cash flow hedges are primarily recorded in revenue.