Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified				9 Months Ended
	May 31, 2011	Mar. 31, 2010	Oct. 29, 2011 Dividend Declared [Member]	Oct. 29, 2011 Third Party Sourcing Business [Member] Sale [Member]
Subsequent Event [Line Items]
Special dividend declared	$ 1	$ 1	$ 2
Estimated Dividend To Be Paid			$ 600
Percent Of Business Divested				51.00%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries				125
Estimated Gain From Divestiture Net Of Tax				$ 115