v2.4.0.6
Long-Term Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument Table [Line Items]    
Total Long-Term Debt $ 6,290,000,000 $ 5,040,000,000
Current Portion of Long-Term Debt 406,579,000 0
Unamortized Debt Discount 40,787,000 30,834,000
Total Long-Term Debt, Net 5,905,602,000 5,009,166,000
Long-Term Debt by Maturity [Abstract]    
Aggregate annual maturity of long-term debt in 2013 400,000,000  
Aggregate annual maturity of long-term debt in 2014 500,000,000  
Aggregate annual maturity of long-term debt in 2015 500,000,000  
Aggregate annual maturity of long-term debt in 2016 400,000,000  
Aggregate annual maturity of long-term debt in 2017 600,000,000  
Line of Credit Facility [Line Items]    
Base rate at period end (in hundredths) 3.25%  
Capital Lease [Abstract]    
Capital Lease Term (in years) 10  
Capital Lease Optional Additional Term (in years) 5  
Capital Lease Obligations 62,968,000 0
Capital Lease Obligations, Noncurrent 56,000,000  
Capital Lease Obligations, Current 7,000,000  
Capital Leases, Future Minimum Payments Due 72,000,000  
Uncommitted Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Average Borrowings Outstanding 41,000  
Weighted average interest rate (in hundredths) 0.70%  
Commercial Paper [Member]
    
Line of Credit Facility [Line Items]    
Average Borrowings Outstanding 236,000,000  
Weighted average interest rate (in hundredths) 0.45%  
Revolving Credit Agreement 2011 [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Expiration Date Oct. 11, 2016  
Maximum borrowing capacity 2,000,000,000  
Eurodollar rate at period end (in hundredths) 1.08%  
Maximum total debt-to-total capitalization ratio allowed under financial covenant (in hundredths) 65.00%  
Advances up to an aggregate principal amount 2,000,000,000  
Increases in the aggregate commitments to an amount not to exceed 3,000,000,000  
Senior Notes Due 2013 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 400,000,000 400,000,000
Floating Rate Senior Notes Due 2014 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 350,000,000 350,000,000
Senior Notes Due 2015 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 500,000,000 500,000,000
Senior Notes Due 2016 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 400,000,000 400,000,000
Senior Notes Due 2017 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 600,000,000 600,000,000
Senior Notes Due 2018 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 350,000,000 350,000,000
Senior Notes Due 2019 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 900,000,000 900,000,000
Senior Notes Due 2020 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 500,000,000 500,000,000
Senior Notes Due 2021 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 750,000,000 750,000,000
Senior Notes Due 2023 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 1,250,000,000 0
Debt Instrument Issuance [Abstract]    
Debt Instrument Offering Date Sep. 10, 2012  
Debt Instrument Issuance Face Amount 1,250,000,000  
Debt Instrument Issuance Interest Rate 2.625%  
Debt Instrument Frequency of Periodic Payment semi-annually  
Proceeds From Issuance of Senior Long-Term Debt 1,234,000,000  
Effective Interest Rate (in hundredths) 2.784%  
Senior Notes Due 2028 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 140,000,000 140,000,000
Subsidiary Debt Due 2014 [Member]
    
Debt Instrument Table [Line Items]    
Total Long-Term Debt 150,000,000 150,000,000
Subsidiary Debt Due 2014 (Canadian) 201,300,000  
Interest Rate - Canadian Subsidiary Note 5.275%  
Debt Instrument Issuance [Abstract]    
Debt Instrument, Maturity Date Mar. 15, 2014  
Debt Instrument Issuance Face Amount $ 150,000,000  
Debt Instrument Issuance Interest Rate 4.75%