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Debt (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Debt Instrument [Line Items]        
Document Period End Date   Jun. 30, 2013    
Extinguishment of Debt, Amount $ 405,000,000      
Gains (Losses) on Extinguishment of Debt 25,000,000      
Derivative, Notional Amount 450,000,000 450,000,000    
Notional Amount Of Interest Rate Derivatives Unwound During Period 225,000,000 225,000,000    
Principal payments of long-term obligations   779,637,000 550,000,000  
Short-term Debt, Weighted Average Interest Rate 0.46% 0.46%    
Debt Instrument, Unamortized Discount (Premium), Net 43,669,000 43,669,000   52,375,000
Total Debt 3,654,032,000 3,654,032,000   4,017,375,000
Debt, Current 0 0   375,000,000
Long-term Debt 3,654,032,000 3,654,032,000   3,642,375,000
Loans Payable [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Face Amount 230,000,000 230,000,000   230,000,000
Debt Due 2013 [Member]
       
Debt Instrument [Line Items]        
Principal payments of long-term obligations   375,000,000    
Debt Instrument, Interest Rate, Stated Percentage 3.875% 3.875%    
Debt Instrument, Face Amount       375,000,000
Debt Due 2014 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.875% 4.875%    
Debt Instrument, Face Amount 299,570,000 299,570,000   450,000,000
Debt Due 2015 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.00% 5.00%    
Debt Instrument, Face Amount 274,879,000 274,879,000   400,000,000
Debt Due 2016 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.75% 4.75%    
Debt Instrument, Face Amount 370,914,000 370,914,000   500,000,000
Debt Due 2017 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.75% 5.75%    
Debt Instrument, Face Amount 500,000,000 500,000,000   500,000,000
Debt Due 2019 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.25% 6.25%    
Debt Instrument, Face Amount 300,000,000 300,000,000   300,000,000
Debt Due 2037 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.25% 5.25%    
Debt Instrument, Face Amount 110,000,000 110,000,000   110,000,000
Debt Due 2037 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.25% 5.25%    
Debt Instrument, Face Amount 500,000,000 500,000,000   500,000,000
Debt Due 2043 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.70% 6.70%    
Debt Instrument, Face Amount 425,000,000 425,000,000   0
Maximum [Member]
       
Debt Instrument [Line Items]        
Commercial Paper 100,000,000 100,000,000    
Average Borrowings [Member]
       
Debt Instrument [Line Items]        
Commercial Paper 75,000,000 75,000,000    
LIBOR [Member] | Debt Due 2018 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.60% 5.60%    
Debt Instrument, Face Amount 250,000,000 250,000,000   250,000,000
Prime Rate [Member] | Debt Due 2018 [Member]
       
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.75% 4.75%    
Debt Instrument, Face Amount $ 350,000,000 $ 350,000,000   $ 350,000,000