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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2011	Apr. 28, 2012	Jul. 31, 2010 Interest Rate Swaps [Member]	Mar. 31, 2011 Interest Rate Swaps [Member]
Derivative [Line Items]
Net derivative losses to be reclassified from AOCI into earnings in next twelve months		$ 21
Foreign currency cash flow hedges maturity period, maximum, months		18
Senior fixed-rate debt issued 2006 due date			2016
Derivative maturity period, minimum year				2014
Derivative maturity period, maximum year				2017
Loss in OCI for the effective portion of net investment hedges	$ 9	$ 6

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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- Definition

Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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