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Fair Value of Financial Investments (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Recurring Fair Value Measurements
Investments, fair value disclosure	$ 100	$ 112
Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure	22	22
Auction rate securities [Member] \| Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure	22	22
Quoted Market Prices (Level 1) [Member] \| Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure
Quoted Market Prices (Level 1) [Member] \| Auction rate securities [Member] \| Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure
Significant Other Observable Inputs (Level 2) [Member] \| Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure
Significant Other Observable Inputs (Level 2) [Member] \| Auction rate securities [Member] \| Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure
Significant Unobservable Inputs (Level 3) [Member] \| Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure	22	22
Significant Unobservable Inputs (Level 3) [Member] \| Auction rate securities [Member] \| Recurring investments [Member]
Recurring Fair Value Measurements
Investments, fair value disclosure	$ 22	$ 22

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 investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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