Other Comprehensive Income Related to Derivatives, Net of Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2012	Mar. 26, 2011	Mar. 31, 2012	Mar. 26, 2011
Comprehensive Income (Loss) [Line Items]
Change in fair value of derivatives	$ (21)	$ (140)	$ 66	$ (183)
Adjustment for net gains/losses realized and included in net income	(97)	58	(251)	344
Change in unrecognized gains/losses on derivative instruments	$ (118)	$ (82)	$ (185)	$ 161

Net of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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+ Details

- Definition

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

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+ Details