Equity Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 29, 2012		Dec. 31, 2011
Changes in Accumulated Other Comprehensive Loss, Net of Tax [Abstract]
Estimated tax rate	37.00%		37.00%
Accumulated Other Comprehensive Income [Roll Forward]
Market Value Adjustments, Investments, Beginning Balance	$ 3		$ 6
Market Value Adjustments, Cash Flow Hedges, Beginning Balance	(52)		(54)
Unrecognized Pension and Post-retirement Medical Expense, Beginning Balance	(3,234)		(2,625)
Foreign Currency Translation and Other, Beginning Balance	17		43
AOCI, Beginning Balance	(3,266)		(2,630)
Unrealized gains (losses) arising during the period, Investments	17		2
Unrealized gain (losses) arising during the period, Cash Flow Hedges	65		28
Unrealized gains (losses) arising during the period, Pension and Post-retirement Medical Expense	0		0
Unrealized gains (losses) arising during the period, Foreign Currency Translation and Other	(17)		(31)
Unrealized gains (losses) arising during the period, AOCI	65		(1)
Reclassifications of net (gains) losses to net income, Investments	0		0
Reclassifications of net (gains) losses to net income, Cash Flow Hedges	(6)	[1]	2	[1]
Reclassifications of net (gains) losses to net income, Unrecognized Pension and Post-retirement Medical Expense	73		55
Reclassifications of net (gains) losses to net income, Foreign Currency Translation and Other	6		0
Reclassifications of net (gains) losses to net income, AOCI	73		57
Market Value Adjustments, Investments, Ending Balance	20		8
Market Value Adjustments, Cash Flow Hedges, Ending Balance	7		(24)
Unrecognized Pension and Post-retirement Medical Expense, Ending Balance	(3,161)		(2,570)
Foreign Currency Translation and Other, Ending Balance	6		12
AOCI, Ending Balance	$ (3,128)		$ (2,574)

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