Debt (Fair Value Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Feb. 12, 2012	Aug. 28, 2011
Debt Instrument [Line Items]
Total long-term debt, Carrying Value	$ 2,280	$ 2,153
Total long-term debt, Fair Value	2,557	2,435
Less current portion, Carrying Value	900	900
Less current portion, Fair Value	903	924
Long-term debt, excluding current portion, Carrying Value	1,380	1,253
Long-term debt, excluding current portion, Fair Value	1,654	1,511
5.5% Senior Notes Due March 2017 [Member]
Debt Instrument [Line Items]
Total long-term debt, Carrying Value	1,097	1,097
Total long-term debt, Fair Value	1,319	1,314
Loan interest rate, fixed	5.50%
Debt instrument, principal due date	March 2017
5.3% Senior Notes Due March 2012 [Member]
Debt Instrument [Line Items]
Total long-term debt, Carrying Value	900	900
Total long-term debt, Fair Value	903	924
Less current portion, Carrying Value	900
Loan interest rate, fixed	5.30%
Debt instrument, principal due date	March 2012
2.695% Promissory Notes Due October 2017 [Member]
Debt Instrument [Line Items]
Total long-term debt, Carrying Value	84	85
Total long-term debt, Fair Value	93	94
Loan interest rate, fixed	2.695%
Debt instrument, principal due date	October 2017
1.18% Fixed-Rate Note Due October 2018 [Member]
Debt Instrument [Line Items]
Total long-term debt, Carrying Value	129	0
Total long-term debt, Fair Value	132	0
Loan interest rate, fixed	1.18%
Debt instrument, principal due date	October 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Total long-term debt, Carrying Value	70	71
Total long-term debt, Fair Value	$ 110	$ 103