Fair Value of Financial Instruments (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Fair Value of Financial Instruments
Carrying value of long-term debt, including current portion	$ 7,200,000,000	$ 6,400,000,000
Liabilities Recorded at Fair Value in the Financial Statements:
Interest Rate Swap Liabilities (included in other non-current liabilities)	100,000,000	108,000,000
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Long-term Debt, including the current portion:
Senior Notes	4,307,000,000	2,789,000,000
Convertible Notes	718,000,000	697,000,000
Term Loans	1,655,000,000	1,632,000,000
Total Long-term Debt, including the current portion:	6,680,000,000	5,118,000,000
Recurring basis \| Significant Other Observable Inputs (Level 2)
Liabilities Recorded at Fair Value in the Financial Statements:
Interest Rate Swap Liabilities (included in other non-current liabilities)	100,000,000	108,000,000
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements	100,000,000	108,000,000
Long-term Debt, including the current portion:
Convertible Notes	1,419,000,000	1,189,000,000
Commercial Mortgage	79,000,000	79,000,000
Capital Leases and Other	28,000,000	29,000,000
Total Long-term Debt, including the current portion:	1,526,000,000	1,297,000,000
Total Carrying Value in Consolidated Balance Sheet
Liabilities Recorded at Fair Value in the Financial Statements:
Interest Rate Swap Liabilities (included in other non-current liabilities)	100,000,000	108,000,000
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements	100,000,000	108,000,000
Long-term Debt, including the current portion:
Senior Notes	4,120,000,000	2,885,000,000
Convertible Notes	1,331,000,000	1,788,000,000
Term Loans	1,679,000,000	1,679,000,000
Commercial Mortgage	66,000,000	67,000,000
Capital Leases and Other	28,000,000	29,000,000
Total Long-term Debt, including the current portion:	$ 7,224,000,000	$ 6,448,000,000

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. Fair value of sum total of minimum lease payments, during the lease term net of payments or other amounts applied to the principal and aggregate of other miscellaneous borrowings owed by the reporting entity at the balance sheet date.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date, net of unamortized discount or premium.

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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. Fair value of convertible debt at the balance sheet date.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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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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Carrying value as of the balance sheet date of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer), excluding the current portion, if any. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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