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Debt (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Document Period End Date Mar. 31, 2013  
Extinguishment of Debt, Amount $ 405,000,000  
Derivative, Notional Amount 450,000,000  
Short-term Debt, Weighted Average Interest Rate 0.41%  
Debt Instrument, Unamortized Discount (Premium), Net 47,271,000 52,375,000
Total Debt 4,032,634,000 4,017,375,000
Debt, Current 375,000,000 375,000,000
Gains (Losses) on Extinguishment of Debt 25,000,000  
Long-term Debt 3,657,634,000 3,642,375,000
Notional Amount Of Interest Rate Derivatives Unwound During Period 225,000,000  
Loans Payable [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 230,000,000 230,000,000
Debt Due 2013 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.875%  
Debt Instrument, Face Amount 375,000,000 375,000,000
Debt Due 2014 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.875%  
Debt Instrument, Face Amount 299,570,000 450,000,000
Debt Due 2015 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.00%  
Debt Instrument, Face Amount 274,879,000 400,000,000
Debt Due 2016 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
Debt Instrument, Face Amount 370,914,000 500,000,000
Debt Due 2017 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.75%  
Debt Instrument, Face Amount 500,000,000 500,000,000
Debt Due 2019 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.25%  
Debt Instrument, Face Amount 300,000,000 300,000,000
Debt Due 2037 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.25%  
Debt Instrument, Face Amount 110,000,000 110,000,000
Debt Due 2037 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.25%  
Debt Instrument, Face Amount 500,000,000 500,000,000
Debt Due 2043 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.70%  
Debt Instrument, Face Amount 425,000,000 0
Maximum [Member]
   
Debt Instrument [Line Items]    
Commercial Paper 300,000,000  
Average Borrowings [Member]
   
Debt Instrument [Line Items]    
Commercial Paper 100,000,000  
LIBOR [Member] | Debt Due 2018 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.60%  
Debt Instrument, Face Amount 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%  
Debt Instrument, Face Amount $ 350,000,000 $ 350,000,000