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Debt Obligations (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]      
Principal Outstanding $ 22,497.8   $ 21,389.2
Other, non-principal amounts (37.7)   (25.4)
Less current maturities of debt [1] (1,619.4)   (2,206.4)
Total long-term debt 20,840.7   19,157.4
Debt Obligations Terms [Abstract]      
Gains on early extinguishment of debt 1.4 $ 0.0  
Letters of credit outstanding for facilities and motor fuel tax obligations 2.5    
Senior Debt Obligations [Member]      
Debt Instrument [Line Items]      
Principal Outstanding 21,019.5   19,856.5
Debt Obligations Terms [Abstract]      
Aggregate debt principal issued 2,500.0    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 869.5   906.5
Debt Obligations Terms [Abstract]      
Interest Rate Terms variable    
Information regarding variable interest rates paid [Abstract]      
Variable Interest Rates Paid, Minimum (in hundredths) 0.35%    
Variable Interest Rates Paid, Maximum (in hundredths) 0.78%    
Weighted-Average Interest Rate Paid (in hundredths) 0.59%    
Senior Debt Obligations [Member] | EPO Senior Notes I [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 0.0   250.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.00%    
Maturity Date Mar. 01, 2015    
Repayment of debt obligations $ 250.0    
Senior Debt Obligations [Member] | EPO Senior Notes X [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 0.0   400.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 3.70%    
Maturity Date Jun. 01, 2015    
Repayment of debt obligations $ 400.0    
Senior Debt Obligations [Member] | EPO Senior Notes FF [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 0.0   650.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 1.25%    
Maturity Date Aug. 13, 2015    
Senior Debt Obligations [Member] | 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 Feb. 01, 2016    
Senior Debt Obligations [Member] | EPO 364-Day Credit Agreement [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 0.0   0.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms variable    
Maturity Date Sep. 14, 2016    
Maximum borrowing capacity $ 1,500.0    
Maximum bank commitments increase 200.0    
Senior Debt Obligations [Member] | 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 Sep. 01, 2017    
Senior Debt Obligations [Member] | 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 Apr. 15, 2018    
Senior Debt Obligations [Member] | EPO Senior Notes OO [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 750.0   0.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 1.65%    
Maturity Date May 07, 2018    
Aggregate debt principal issued $ 750.0    
Debt issued as percent of principal amount (in hundredths) 99.881%    
Senior Debt Obligations [Member] | 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 Jan. 31, 2019    
Senior Debt Obligations [Member] | EPO Senior Notes LL [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) 2.55%    
Maturity Date Oct. 15, 2019    
Senior Debt Obligations [Member] | 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 Jan. 31, 2020    
Senior Debt Obligations [Member] | 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 Sep. 01, 2020    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 0.0   0.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms variable    
Maturity Date Sep. 15, 2020    
Maximum borrowing capacity $ 4,000.0   3,500.0
Maximum bank commitments increase $ 500.0    
Information regarding variable interest rates paid [Abstract]      
Variable Interest Rates Paid, Minimum (in hundredths) 1.15%    
Variable Interest Rates Paid, Maximum (in hundredths) 3.25%    
Weighted-Average Interest Rate Paid (in hundredths) 1.30%    
Senior Debt Obligations [Member] | 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 Feb. 15, 2022    
Senior Debt Obligations [Member] | EPO Senior Notes HH [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 1,250.0   1,250.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 3.35%    
Maturity Date Mar. 15, 2023    
Senior Debt Obligations [Member] | EPO Senior Notes JJ [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 850.0   850.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 3.90%    
Maturity Date Feb. 15, 2024    
Senior Debt Obligations [Member] | EPO Senior Notes MM [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 1,150.0   1,150.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 3.75%    
Maturity Date Feb. 15, 2025    
Senior Debt Obligations [Member] | EPO Senior Notes PP [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 875.0   0.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 3.70%    
Maturity Date Feb. 15, 2026    
Aggregate debt principal issued $ 875.0    
Debt issued as percent of principal amount (in hundredths) 99.635%    
Senior Debt Obligations [Member] | 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 Mar. 01, 2033    
Senior Debt Obligations [Member] | 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 Oct. 15, 2034    
Senior Debt Obligations [Member] | 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 Mar. 01, 2035    
Senior Debt Obligations [Member] | 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 Apr. 15, 2038    
Senior Debt Obligations [Member] | 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 Oct. 15, 2039    
Senior Debt Obligations [Member] | 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 Sep. 01, 2040    
Senior Debt Obligations [Member] | 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 Feb. 01, 2041    
Senior Debt Obligations [Member] | 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 Feb. 15, 2042    
Senior Debt Obligations [Member] | 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 Aug. 15, 2042    
Senior Debt Obligations [Member] | 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 Feb. 15, 2043    
Senior Debt Obligations [Member] | EPO Senior Notes II [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 1,400.0   1,400.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 4.85%    
Maturity Date Mar. 15, 2044    
Senior Debt Obligations [Member] | EPO Senior Notes KK [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 1,150.0   1,150.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 5.10%    
Maturity Date Feb. 15, 2045    
Senior Debt Obligations [Member] | EPO Senior Notes QQ [Member]      
Debt Instrument [Line Items]      
Principal Outstanding $ 875.0   0.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms fixed    
Interest Rate, stated percentage (in hundredths) 4.90%    
Maturity Date May 15, 2046    
Aggregate debt principal issued $ 875.0    
Debt issued as percent of principal amount (in hundredths) 99.635%    
Senior Debt Obligations [Member] | EPO Senior Notes NN [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) 4.95%    
Maturity Date Oct. 15, 2054    
Senior Debt Obligations [Member] | 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 Apr. 15, 2018    
Senior Debt Obligations [Member] | 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 Apr. 15, 2038    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member]      
Debt Instrument [Line Items]      
Principal Outstanding [2] $ 521.9   550.0
Debt Obligations Terms [Abstract]      
Interest Rate Terms [2] fixed/variable    
Interest Rate, stated percentage (in hundredths) [2] 8.375%    
Maturity Date [2] Aug. 31, 2066    
Repayment of debt obligations $ 28.1    
Date through which interest rate is fixed 8/1/2016    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate (in hundredths) 3.7075%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member]      
Debt Instrument [Line Items]      
Principal Outstanding [3] $ 259.5   285.8
Debt Obligations Terms [Abstract]      
Interest Rate Terms [3] fixed/variable    
Interest Rate, stated percentage (in hundredths) [3] 7.00%    
Maturity Date [3] Jun. 01, 2067    
Repayment of debt obligations $ 26.3    
Date through which interest rate is fixed 9/1/2017    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate (in hundredths) 2.7775%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member]      
Debt Instrument [Line Items]      
Principal Outstanding [4] $ 682.7   682.7
Debt Obligations Terms [Abstract]      
Interest Rate Terms [4] fixed/variable    
Interest Rate, stated percentage (in hundredths) [4] 7.034%    
Maturity Date [4] Jan. 15, 2068    
Date through which interest rate is fixed 1/15/2018    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate (in hundredths) 2.68%    
Minimum variable annual interest rate (in hundredths) 7.034%    
Junior Debt Obligations [Member] | 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 Jun. 01, 2067    
[1] We expect to refinance the current maturities of our debt obligations at or prior to their maturity.
[2] Fixed rate of 8.375% through August 1, 2016 (i.e., first call date without a make-whole redemption premium); thereafter, variable rate based on 3-month LIBOR plus 3.7075%. During the third quarter of 2015, EPO retired $28.1 million of these junior notes.
[3] Fixed rate of 7.0% through September 1, 2017 (i.e., first call date without a make-whole redemption premium); thereafter, variable rate based on 3-month LIBOR plus 2.7775%. During the third quarter of 2015, EPO retired $26.3 million of these junior notes.
[4] Fixed rate of 7.034% through January 15, 2018 (i.e., first call date without a make-whole redemption premium); thereafter, the rate will be the greater of 7.034% or a variable rate based on 3-month LIBOR plus 2.68%.