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Fair Value of Financial Instruments - Liabilities, Recurring (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Carrying value of long-term debt, including current portion $ 8,546 $ 8,732
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 current and non-current liabilities) 45 56
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 45 56
Long-term Debt, including the current portion:    
Term Loans 2,602 2,603
Senior Notes 5,186 5,185
Convertible Notes 675 846
Capital Leases and Other 83 98
Total Long-term Debt, including the current portion: 8,546 8,732
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 current and 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 2,643 2,631
Senior Notes 5,727 5,712
Convertible Notes 267 286
Capital Leases and Other 0 0
Total Long-term Debt, including the current portion: 8,637 8,629
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 current and non-current liabilities) 45 56
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 45 56
Long-term Debt, including the current portion:    
Term Loans 0 0
Senior Notes 0 0
Convertible Notes 554 748
Capital Leases and Other 83 98
Total Long-term Debt, including the current portion: $ 637 $ 846