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Fair Value Measurements - Fair and Carrying Value (Details) (USD $) In Millions, unless otherwise specified	Dec. 01, 2011	Sep. 01, 2011
Fair Value [Member] \| Level 1 [Member]
Fair value disclosure [Line Items]
Fair value of convertible debt instruments	$ 1,082	$ 1,216
Fair Value [Member] \| Level 2 [Member]
Fair value disclosure [Line Items]
Fair value of convertible debt instruments	737	629
Other debt instruments	530	436
Carrying Value [Member] \| Level 1 [Member]
Fair value disclosure [Line Items]
Fair value of convertible debt instruments	965	1,049
Carrying Value [Member] \| Level 2 [Member]
Fair value disclosure [Line Items]
Fair value of convertible debt instruments	629	529
Other debt instruments	$ 525	$ 423

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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