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Fair Value of Financial Instruments - Liabilities, Recurring (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value Disclosures [Abstract]    
Carrying value of long-term debt, including current portion $ 8,732 $ 8,450
Fair Value, Measurements, Recurring | 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) 56 90
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 56 90
Long-term Debt, including the current portion:    
Term Loans 2,603 2,567
Senior Notes 5,185 4,716
Convertible Notes 846 939
Commercial Mortgage 0 65
Capital Leases and Other 98 163
Total Long-term Debt, including the current portion: 8,732 8,450
Fair Value, Measurements, Recurring | Unadjusted quoted prices in active markets for identical assets or liabilities (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:    
Term Loans 2,631 2,518
Senior Notes 5,712 4,822
Convertible Notes 286 247
Commercial Mortgage 0 0
Capital Leases and Other 0 0
Total Long-term Debt, including the current portion: 8,629 7,587
Fair Value, Measurements, Recurring | 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) 56 90
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 56 90
Long-term Debt, including the current portion:    
Term Loans 0 0
Senior Notes 0 0
Convertible Notes 748 834
Commercial Mortgage 0 73
Capital Leases and Other 98 163
Total Long-term Debt, including the current portion: $ 846 $ 1,070