Stock-Based Compensation Plans - Summary of Stock Option Transactions (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014		Dec. 10, 2012
Number of options
Number of options outstanding at September 1, 2013	1,947		2,905
Exercised	(971)
Number of options outstanding at August 31, 2014	976		2,905
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price at September 1, 2013	$ 39.70
Exercised	$ 38.47
Weighted-average exercise price at August 31, 2014	$ 40.92	[1]
Weighted Average Remaining Contractual Term [Abstract]
Weighted-average remaining contractual term (in years)	7 months 9 days
Aggregate intrinsic value
Aggregate intrinsic value	$ 78	[2]

[1] The exercise prices for the remaining options outstanding at the end of 2014 ranged from $40.69 to $43.17.

[2] The difference between the exercise price and market value of common stock at the end of 2014.