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Debt Obligations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Feb. 29, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Principal Outstanding $ 14,582.7   $ 14,482.7
Other, non-principal amounts:      
Change in fair value of debt hedged in fair value hedging relationship 35.2 [1]   73.8 [1]
Unamortized discounts, net of premiums (33)   (30)
Unamortized deferred net gains related to terminated interest rate swaps 35.9 [1]   2.9 [1]
Total other, non-principal amounts 38.1   46.7
Less current maturities of debt (1,050.0) [2]   (500.0) [2]
Total long-term debt 13,570.8   14,029.4
Scheduled Maturities of Debt [Abstract]      
Remainder of 2012 500.0    
2013 1,200.0    
2014 1,150.0    
2015 650.0    
2016 750.0    
After 2016 10,332.7    
Total 14,582.7   14,482.7
EPO Letter of credit related to commodity derivative instruments 77.5    
Total principal amount of senior debt obligations [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 13,050.0   12,950.0
Scheduled Maturities of Debt [Abstract]      
Total 13,050.0   12,950.0
Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 0    
Scheduled Maturities of Debt [Abstract]      
Remainder of 2012 0    
2013 0    
2014 0    
2015 0    
2016 0    
After 2016 0    
Total 0    
Senior Notes [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 13,050.0    
Scheduled Maturities of Debt [Abstract]      
Remainder of 2012 500.0    
2013 1,200.0    
2014 1,150.0    
2015 650.0    
2016 750.0    
After 2016 8,800.0    
Total 13,050.0    
Junior Subordinated Notes [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 1,532.7    
Scheduled Maturities of Debt [Abstract]      
Remainder of 2012 0    
2013 0    
2014 0    
2015 0    
2016 0    
After 2016 1,532.7    
Total 1,532.7    
EPO Senior Notes S [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 0   490.5
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 7.625%    
Maturity Date February 2012    
Scheduled Maturities of Debt [Abstract]      
Total 0   490.5
EPO Senior Notes P [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 500.0   500.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 4.60%    
Maturity Date August 2012    
Scheduled Maturities of Debt [Abstract]      
Total 500.0   500.0
EPO Senior Notes C [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 350.0   350.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.375%    
Maturity Date February 2013    
Scheduled Maturities of Debt [Abstract]      
Total 350.0   350.0
EPO Senior Notes T [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 182.5   182.5
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.125%    
Maturity Date February 2013    
Scheduled Maturities of Debt [Abstract]      
Total 182.5   182.5
EPO Senior Notes M [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 400.0   400.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.65%    
Maturity Date April 2013    
Scheduled Maturities of Debt [Abstract]      
Total 400.0   400.0
EPO Senior Notes U [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 237.6   237.6
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.90%    
Maturity Date April 2013    
Scheduled Maturities of Debt [Abstract]      
Total 237.6   237.6
EPO Senior Notes O [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 500.0   500.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 9.75%    
Maturity Date January 2014    
Scheduled Maturities of Debt [Abstract]      
Total 500.0   500.0
EPO Senior Notes G [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 650.0   650.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.60%    
Maturity Date October 2014    
Scheduled Maturities of Debt [Abstract]      
Total 650.0   650.0
EPO Senior Notes I [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 250.0   250.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.00%    
Maturity Date March 2015    
Scheduled Maturities of Debt [Abstract]      
Total 250.0   250.0
EPO Senior Notes X [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 400.0   400.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 3.70%    
Maturity Date June 2015    
Scheduled Maturities of Debt [Abstract]      
Total 400.0   400.0
EPO Senior Notes AA [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 750.0   750.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 3.20%    
Maturity Date February 2016    
Scheduled Maturities of Debt [Abstract]      
Total 750.0   750.0
EPO $3.5 Billion Multi-Year Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 0   150.0
Other, non-principal amounts:      
Interest Rate Terms variable    
Maturity Date September 2016    
Scheduled Maturities of Debt [Abstract]      
Total 0   150.0
Maximum borrowing capacity 3,500    
Information regarding variable interest rates paid [Abstract]      
Variable Interest Rates Paid, Minimum (in hundredths) 1.62%    
Variable Interest Rates Paid, Maximum (in hundredths) 1.67%    
Weighted-Average Interest Rate Paid (in hundredths) 1.66%    
EPO Senior Notes L [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 800.0   800.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.30%    
Maturity Date September 2017    
Scheduled Maturities of Debt [Abstract]      
Total 800.0   800.0
EPO Senior Notes V [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 349.7   349.7
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.65%    
Maturity Date April 2018    
Scheduled Maturities of Debt [Abstract]      
Total 349.7   349.7
EPO Senior Notes N [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 700.0   700.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.50%    
Maturity Date January 2019    
Scheduled Maturities of Debt [Abstract]      
Total 700.0   700.0
EPO Senior Notes Q [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 500.0   500.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.25%    
Maturity Date January 2020    
Scheduled Maturities of Debt [Abstract]      
Total 500.0   500.0
EPO Senior Notes Y [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 1,000.0   1,000.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.20%    
Maturity Date September 2020    
Scheduled Maturities of Debt [Abstract]      
Total 1,000.0   1,000.0
EPO Senior Notes CC [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 650.0   650.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 4.05%    
Maturity Date February 2022    
Scheduled Maturities of Debt [Abstract]      
Total 650.0   650.0
EPO Senior Notes D [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 500.0   500.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.875%    
Maturity Date March 2033    
Scheduled Maturities of Debt [Abstract]      
Total 500.0   500.0
EPO Senior Notes H [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 350.0   350.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.65%    
Maturity Date October 2034    
Scheduled Maturities of Debt [Abstract]      
Total 350.0   350.0
EPO Senior Notes J [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 250.0   250.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.75%    
Maturity Date March 2035    
Scheduled Maturities of Debt [Abstract]      
Total 250.0   250.0
EPO Senior Notes W [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 399.6   399.6
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 7.55%    
Maturity Date April 2038    
Scheduled Maturities of Debt [Abstract]      
Total 399.6   399.6
EPO Senior Notes R [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 600.0   600.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.125%    
Maturity Date October 2039    
Scheduled Maturities of Debt [Abstract]      
Total 600.0   600.0
EPO Senior Notes Z [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 600.0   600.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.45%    
Maturity Date September 2040    
Scheduled Maturities of Debt [Abstract]      
Total 600.0   600.0
EPO Senior Notes BB [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 750.0   750.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.95%    
Maturity Date February 2041    
Scheduled Maturities of Debt [Abstract]      
Total 750.0   750.0
EPO Senior Notes DD [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 600.0   600.0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.70%    
Maturity Date February 2042    
Scheduled Maturities of Debt [Abstract]      
Total 600.0   600.0
EPO Senior Notes EE [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 750.0   0
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 4.85%    
Maturity Date August 2042    
Scheduled Maturities of Debt [Abstract]      
Total 750.0   0
Aggregate debt principal issued   750  
Debt issued as percent of principal amount (in hundredths)   99.542%  
Maturity term (in years) 30    
TEPPCO Senior Notes 1 [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 0   9.5
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 7.625%    
Maturity Date February 2012    
Scheduled Maturities of Debt [Abstract]      
Total 0   9.5
TEPPCO Senior Notes 2 [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 17.5   17.5
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.125%    
Maturity Date February 2013    
Scheduled Maturities of Debt [Abstract]      
Total 17.5   17.5
TEPPCO Senior Notes 3 [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 12.4   12.4
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.90%    
Maturity Date April 2013    
Scheduled Maturities of Debt [Abstract]      
Total 12.4   12.4
TEPPCO Senior Notes 4 [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 0.3   0.3
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 6.65%    
Maturity Date April 2018    
Scheduled Maturities of Debt [Abstract]      
Total 0.3   0.3
TEPPCO Senior Notes 5 [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 0.4   0.4
Other, non-principal amounts:      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 7.55%    
Maturity Date April 2038    
Scheduled Maturities of Debt [Abstract]      
Total 0.4   0.4
EPO Junior Subordinated Notes A [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 550.0   550.0
Other, non-principal amounts:      
Interest Rate Terms fixed/variable    
Maturity Date August 2066    
Scheduled Maturities of Debt [Abstract]      
Total 550.0   550.0
EPO Junior Subordinated Notes C [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 285.8   285.8
Other, non-principal amounts:      
Interest Rate Terms fixed/variable    
Maturity Date June 2067    
Scheduled Maturities of Debt [Abstract]      
Total 285.8   285.8
EPO Junior Subordinated Notes B [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 682.7   682.7
Other, non-principal amounts:      
Interest Rate Terms fixed/variable    
Maturity Date January 2068    
Scheduled Maturities of Debt [Abstract]      
Total 682.7   682.7
TEPPCO Junior Subordinated Notes [Member]
     
Debt Instrument [Line Items]      
Principal Outstanding 14.2   14.2
Other, non-principal amounts:      
Interest Rate Terms fixed/variable    
Maturity Date June 2067    
Scheduled Maturities of Debt [Abstract]      
Total $ 14.2   $ 14.2
[1] See Note 4 for information regarding our interest rate hedging activities.
[2] We expect to refinance the current maturities of our debt obligations prior to their maturity.