Share-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Nov. 30, 2013 Restricted Stock Units (RSUs) [Member]	Nov. 30, 2013 Performance Shares [Member]	Nov. 30, 2013 Performance Share Awards 2014 to 2015 Market Share and Operating Income Plan [Member]	Nov. 30, 2013 Performance Share Awards 2014 to 2015 Market Share and Operating Income Plan [Member] Minimum [Member]	Nov. 30, 2013 Performance Share Awards 2014 to 2015 Market Share and Operating Income Plan [Member] Maximum [Member]	Feb. 28, 2014 Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	219,504	219,504				30,848
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years		2 years
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Annual Vesting Percent	20.00%
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Total Fair Value	$ 7	$ 7
Share Based Compensation Weight Based on Market Share Improvement Used In Calculation Of Performance Targets			50.00%
Share Based Compensation Weight Based on Divisional Operating Income Metrics Used In Calculation Of Performance Targets			50.00%
Performance Based Awards Award Payouts Threshold				50.00%	200.00%