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Fair Value of Financial Instruments - Liabilities, Recurring (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value Disclosures [Abstract]    
Carrying value of long-term debt, including current portion $ 8,450 $ 6,448
Recurring basis | 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) 90 108
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 90 108
Long-term Debt, including the current portion:    
Senior Notes 4,716 2,885
Convertible Notes 939 1,788
Term Loans 2,567 1,679
Commercial Mortgage 65 67
Capital Leases and Other 163 29
Total Long-term Debt, including the current portion: 8,450 6,448
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Liabilities Recorded at Fair Value in the Financial Statements:    
Interest Rate Swap Liabilities (included in other non-current liabilities) 0 0
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 0 0
Long-term Debt, including the current portion:    
Senior Notes 4,822 2,789
Convertible Notes 247 697
Term Loans 2,518 1,632
Commercial Mortgage 0 0
Capital Leases and Other 0 0
Total Long-term Debt, including the current portion: 7,587 5,118
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) 90 108
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 90 108
Long-term Debt, including the current portion:    
Senior Notes 0 0
Convertible Notes 834 1,189
Term Loans 0 0
Commercial Mortgage 73 79
Capital Leases and Other 163 29
Total Long-term Debt, including the current portion: $ 1,070 $ 1,297