Stock-Based Compensation Plans (Summary Of Stock-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 12, 2012	Feb. 13, 2011	Feb. 12, 2012	Feb. 13, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense before income taxes	$ 58	$ 52	$ 134	$ 109
Less recognized income tax benefit	(19)	(16)	(44)	(35)
Total stock-based compensation expense, net of income taxes	39	36	90	74
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense before income taxes	58	52	134	108
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense before income taxes	$ 0	$ 0	$ 0	$ 1