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Debt Obligations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Principal Outstanding $ 17,532.7 $ 16,179.3
Other, non-principal amounts:    
Change in fair value of debt hedged in fair value hedging relationship 35.8 [1] 39.3 [1]
Unamortized discounts, net of premiums (42.6) (38.0)
Other 17.8 21.2
Total other, non-principal amounts 11.0 22.5
Less current maturities of debt (1,150.0) (1,546.6) [2]
Total long-term debt 16,393.7 14,655.2
Total principal amount of senior debt obligations [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 16,000.0 14,646.6
Senior Notes [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 16,000.0  
Commercial Paper [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 0 346.6
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Commercial Paper [Member] | Minimum [Member]
   
Debt Obligations Terms [Abstract]    
Interest Rate, stated percentage (in hundredths) 0.28%  
Commercial Paper [Member] | Maximum [Member]
   
Debt Obligations Terms [Abstract]    
Interest Rate, stated percentage (in hundredths) 0.50%  
EPO Senior Notes C [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 0 350.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.375%  
Maturity Date February 2013  
EPO Senior Notes T [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 0 182.5
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.125%  
Maturity Date February 2013  
EPO Senior Notes M [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 400.0 400.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.65%  
Maturity Date April 2013  
EPO Senior Notes U [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 237.6 237.6
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.90%  
Maturity Date April 2013  
EPO Senior Notes O [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 500.0 500.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 9.75%  
Maturity Date January 2014  
EPO Senior Notes G [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 650.0 650.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.60%  
Maturity Date October 2014  
EPO Senior Notes I [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 250.0 250.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.00%  
Maturity Date March 2015  
EPO Senior Notes X [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 400.0 400.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 3.70%  
Maturity Date June 2015  
EPO Senior Notes FF [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 650.0 650.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 1.25%  
Maturity Date August 2015  
EPO Senior Notes AA [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 750.0 750.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 3.20%  
Maturity Date February 2016  
EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 0 0
Debt Obligations Terms [Abstract]    
Interest Rate Terms variable  
Maturity Date September 2016  
Information regarding variable interest rates paid [Abstract]    
Variable Interest Rates Paid, Minimum (in hundredths) 1.50%  
Variable Interest Rates Paid, Maximum (in hundredths) 1.51%  
Weighted-Average Interest Rate Paid (in hundredths) 1.50%  
EPO Senior Notes L [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 800.0 800.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.30%  
Maturity Date September 2017  
EPO Senior Notes V [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 349.7 349.7
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.65%  
Maturity Date April 2018  
EPO Senior Notes N [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 700.0 700.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.50%  
Maturity Date January 2019  
EPO Senior Notes Q [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 500.0 500.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.25%  
Maturity Date January 2020  
EPO Senior Notes Y [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 1,000.0 1,000.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.20%  
Maturity Date September 2020  
EPO Senior Notes CC [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 650.0 650.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 4.05%  
Maturity Date February 2022  
EPO Senior Notes D [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 500.0 500.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.875%  
Maturity Date March 2033  
EPO Senior Notes H [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 350.0 350.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.65%  
Maturity Date October 2034  
EPO Senior Notes J [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 250.0 250.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.75%  
Maturity Date March 2035  
EPO Senior Notes W [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 399.6 399.6
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 7.55%  
Maturity Date April 2038  
EPO Senior Notes R [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 600.0 600.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.125%  
Maturity Date October 2039  
EPO Senior Notes Z [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 600.0 600.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.45%  
Maturity Date September 2040  
EPO Senior Notes BB [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 750.0 750.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.95%  
Maturity Date February 2041  
EPO Senior Notes DD [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 600.0 600.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.70%  
Maturity Date February 2042  
EPO Senior Notes EE [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 750.0 750.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 4.85%  
Maturity Date August 2042  
EPO Senior Notes GG [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 1,100.0 1,100.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 4.45%  
Maturity Date February 2043  
EPO Senior Notes HH [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 1,250.0 0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 3.35%  
Maturity Date March 2023  
Aggregate debt principal issued 1,250  
Maturity term (in years) 10  
Debt issued as percent of principal amount (in hundredths) 99.908%  
EPO Senior Notes II [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 1,000.0 0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 4.85%  
Maturity Date March 2044  
Aggregate debt principal issued 1,000  
Maturity term (in years) 31  
Debt issued as percent of principal amount (in hundredths) 99.619%  
TEPPCO Senior Notes 2 [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 0 17.5
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.125%  
Maturity Date February 2013  
TEPPCO Senior Notes 3 [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 12.4 12.4
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 5.90%  
Maturity Date April 2013  
TEPPCO Senior Notes 4 [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 0.3 0.3
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 6.65%  
Maturity Date April 2018  
TEPPCO Senior Notes 5 [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 0.4 0.4
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed  
Interest Rate, stated percentage (in hundredths) 7.55%  
Maturity Date April 2038  
EPO Junior Subordinated Notes A [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 550.0 550.0
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed/variable  
Maturity Date August 2066  
EPO Junior Subordinated Notes C [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 285.8 285.8
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed/variable  
Maturity Date June 2067  
EPO Junior Subordinated Notes B [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding 682.7 682.7
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed/variable  
Maturity Date January 2068  
TEPPCO Junior Subordinated Notes [Member]
   
Debt Instrument [Line Items]    
Principal Outstanding $ 14.2 $ 14.2
Debt Obligations Terms [Abstract]    
Interest Rate Terms fixed/variable  
Maturity Date June 2067  
[1] See Note 4 for information regarding our interest rate hedging activities.
[2] We expect to refinance the current maturities of our debt obligations at or prior to their maturity.