Debt - Schedule of Long-term Debt (Details) (USD $)	6 Months Ended			6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended			6 Months Ended			3 Months Ended	6 Months Ended
	Mar. 01, 2012	Mar. 03, 2011	Sep. 01, 2011	Mar. 01, 2012 Convertible senior notes due June 2014 [Member]	Sep. 01, 2011 Convertible senior notes due June 2014 [Member]	Mar. 01, 2012 Capital lease obligations [Member]	Sep. 01, 2011 Capital lease obligations [Member]	Mar. 01, 2012 Convertible senior notes due August 2031A [Member]	Sep. 01, 2011 Convertible senior notes due August 2031A [Member]	Mar. 01, 2012 Convertible senior notes due August 2031B [Member]	Sep. 01, 2011 Convertible senior notes due August 2031B [Member]	Mar. 01, 2012 Convertible senior notes due October 2013 [Member]	Apr. 05, 2012 Convertible senior notes due October 2013 [Member]	Sep. 01, 2011 Convertible senior notes due October 2013 [Member]	Mar. 01, 2012 Convertible senior notes due June 2027 [Member]	Sep. 01, 2011 Convertible senior notes due June 2027 [Member]	Dec. 02, 2010 Convertible senior notes due June 2027 [Member]	Mar. 01, 2012 Sales-leaseback transactions [Member]	Mar. 01, 2012 Sales-leaseback transactions [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,315,000,000		$ 2,001,000,000	$ 837,000,000	$ 815,000,000	$ 702,000,000	$ 423,000,000	$ 260,000,000	$ 255,000,000	$ 239,000,000	$ 234,000,000	$ 139,000,000	$ 139,000,000	$ 139,000,000	$ 138,000,000	$ 135,000,000
Less current portion	(150,000,000)		(140,000,000)
Long-term debt	2,165,000,000		1,861,000,000
Stated interest rate (in hundredths)				1.875%	1.875%			1.50%	1.50%	1.875%	1.875%	4.25%		4.25%	1.875%	1.875%
Effective interest rate (in hundredths)				7.90%	7.90%	5.00%	6.10%	6.50%	6.50%	7.00%	7.00%				6.90%	6.90%
Discount				112,000,000	134,000,000			85,000,000	90,000,000	106,000,000	111,000,000				37,000,000	40,000,000
Due date				Jun. 30, 2014		Aug. 31, 2050		Aug. 31, 2031		Aug. 31, 2031		Oct. 31, 2013			Jun. 30, 2027			Feb. 29, 2016	Feb. 29, 2016
Proceeds from equipment sale-leaseback transactions	340,000,000	95,000,000																230,000,000	340,000,000
Long-term Debt, Gross, current period additions																		230,000,000	340,000,000
Imputed interest rate of sale leaseback additions (in hundredths)																		3.90%	4.00%
Convertible debt due 2027, aggregate principal amount																	175,000,000
Convertible Debt Redemption Notice [Abstract]
Long-term Debt, Gross	2,315,000,000		2,001,000,000	837,000,000	815,000,000	702,000,000	423,000,000	260,000,000	255,000,000	239,000,000	234,000,000	139,000,000	139,000,000	139,000,000	138,000,000	135,000,000
Debt Instrument, Convertible, Conversion Ratio												196.7052
Principal Amount Per Debenture Used In Coversion Rate												$ 1,000
Debt Instrument, Convertible, Conversion Price												$ 5.08
Debt Instrument, Convertible, Number of Equity Instruments												27,300,000