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Fair Value Measurements (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
interest_rate_swaps
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]      
Fair value interest rate swap discount rate 1.60% 1.60%  
Number of interest rate swaps to convert fixed interest rate on notes to floating rate 2    
Assets or liabilities transferred between Level 1 and Level 2   $ 0  
Assets or liabilities transferred between Level 2 and Level 3   0  
Net addition to the fair value of liabilities for prior period acquisitions   10  
Percent change in projections affecting fair value of contigent consideration 5.00%    
Increase in fair value of contingent consideration due to 5% increase in projections 16    
Decrease in fair value of contigent considertion due to 5% decrease in projections 14    
Available-for-sale Securities, Amortized Cost Basis 12 12 16
Minimum [Member]
     
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]      
Revenue target period (in years)   2 years  
Maximum [Member]
     
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]      
Revenue target period (in years)   4 years  
Senior Debt Obligations Due 2014 [Member]
     
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]      
Fair value interest rate swap derivatives $ 250 $ 250