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Debt - Schedule of Long-term Debt (Details) (USD $)
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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 | ||||||||||
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Mar. 01, 2012
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Mar. 03, 2011
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Sep. 01, 2011
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Mar. 01, 2012
Convertible senior notes due June 2014 [Member]
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Sep. 01, 2011
Convertible senior notes due June 2014 [Member]
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Mar. 01, 2012
Capital lease obligations [Member]
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Sep. 01, 2011
Capital lease obligations [Member]
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Mar. 01, 2012
Convertible senior notes due August 2031A [Member]
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Sep. 01, 2011
Convertible senior notes due August 2031A [Member]
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Mar. 01, 2012
Convertible senior notes due August 2031B [Member]
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Sep. 01, 2011
Convertible senior notes due August 2031B [Member]
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Mar. 01, 2012
Convertible senior notes due October 2013 [Member]
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Apr. 05, 2012
Convertible senior notes due October 2013 [Member]
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Sep. 01, 2011
Convertible senior notes due October 2013 [Member]
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Mar. 01, 2012
Convertible senior notes due June 2027 [Member]
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Sep. 01, 2011
Convertible senior notes due June 2027 [Member]
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Dec. 02, 2010
Convertible senior notes due June 2027 [Member]
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Mar. 01, 2012
Sales-leaseback transactions [Member]
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Mar. 01, 2012
Sales-leaseback transactions [Member]
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| 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 | ||||||||||||||||||