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Debt Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt Instrument [Line Items]      
Principal outstanding $ 25,618,500   $ 24,780,100
Other, non-principal amounts (225,300)   (211,400)
Less current maturities of debt (2,376,800)   (2,855,000)
Total long-term debt 23,016,400   21,713,700
Debt Obligations Terms:      
Repayment of debt obligations 15,444,700 $ 17,856,500  
Letters of credit outstanding 66,400    
Senior Debt Obligations [Member]      
Debt Instrument [Line Items]      
Principal outstanding 22,426,800   21,605,700
Debt Obligations Terms:      
Aggregate debt principal issued 2,000,000    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 576,800   1,755,700
Debt Obligations Terms:      
Interest rate terms variable    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 1.79%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 1.50%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 2.50%    
Senior Debt Obligations [Member] | EPO Senior Notes V [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 349,700   349,700
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.65%    
Maturity date Apr. 15, 2018    
Senior Debt Obligations [Member] | EPO Senior Notes OO [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750,000   750,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 1.65%    
Maturity date May 07, 2018    
Senior Debt Obligations [Member] | EPO 364-Day Revolving Credit Agreement [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0   0
Debt Obligations Terms:      
Interest rate terms variable    
Maturity date Sep. 12, 2018    
Senior Debt Obligations [Member] | EPO Senior Notes N [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 700,000   700,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.50%    
Maturity date Jan. 31, 2019    
Senior Debt Obligations [Member] | EPO Senior Notes LL [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 800,000   800,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 2.55%    
Maturity date Oct. 15, 2019    
Senior Debt Obligations [Member] | EPO Senior Notes Q [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 500,000   500,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.25%    
Maturity date Jan. 31, 2020    
Senior Debt Obligations [Member] | EPO Senior Notes Y [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,000,000   1,000,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.20%    
Maturity date Sep. 01, 2020    
Senior Debt Obligations [Member] | EPO Senior Notes TT [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750,000   0
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 2.80%    
Maturity date Feb. 15, 2021    
Aggregate debt principal issued $ 750,000    
Debt issued as percent of principal amount 99.946%    
Senior Debt Obligations [Member] | EPO Senior Notes RR [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 575,000   575,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 2.85%    
Maturity date Apr. 15, 2021    
Senior Debt Obligations [Member] | EPO Senior Notes CC [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 650,000   650,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.05%    
Maturity date Feb. 15, 2022    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0   0
Debt Obligations Terms:      
Interest rate terms variable    
Maturity date Sep. 13, 2022    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 2.58%    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 2.58%    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 2.59%    
Senior Debt Obligations [Member] | EPO Senior Notes HH [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250,000   1,250,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.35%    
Maturity date Mar. 15, 2023    
Senior Debt Obligations [Member] | EPO Senior Notes JJ [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 850,000   850,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.90%    
Maturity date Feb. 15, 2024    
Senior Debt Obligations [Member] | EPO Senior Notes MM [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,150,000   1,150,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.75%    
Maturity date Feb. 15, 2025    
Senior Debt Obligations [Member] | EPO Senior Notes PP [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 875,000   875,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.70%    
Maturity date Feb. 15, 2026    
Senior Debt Obligations [Member] | EPO Senior Notes SS [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 575,000   575,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.95%    
Maturity date Feb. 15, 2027    
Senior Debt Obligations [Member] | EPO Senior Notes D [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 500,000   500,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.875%    
Maturity date Mar. 01, 2033    
Senior Debt Obligations [Member] | EPO Senior Notes H [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 350,000   350,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.65%    
Maturity date Oct. 15, 2034    
Senior Debt Obligations [Member] | EPO Senior Notes J [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 250,000   250,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.75%    
Maturity date Mar. 01, 2035    
Senior Debt Obligations [Member] | EPO Senior Notes W [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 399,600   399,600
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 7.55%    
Maturity date Apr. 15, 2038    
Senior Debt Obligations [Member] | EPO Senior Notes R [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600,000   600,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.125%    
Maturity date Oct. 15, 2039    
Senior Debt Obligations [Member] | EPO Senior Notes Z [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600,000   600,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.45%    
Maturity date Sep. 01, 2040    
Senior Debt Obligations [Member] | EPO Senior Notes BB [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750,000   750,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.95%    
Maturity date Feb. 01, 2041    
Senior Debt Obligations [Member] | EPO Senior Notes DD [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600,000   600,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.70%    
Maturity date Feb. 15, 2042    
Senior Debt Obligations [Member] | EPO Senior Notes EE [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750,000   750,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.85%    
Maturity date Aug. 15, 2042    
Senior Debt Obligations [Member] | EPO Senior Notes GG [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,100,000   1,100,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.45%    
Maturity date Feb. 15, 2043    
Senior Debt Obligations [Member] | EPO Senior Notes II [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,400,000   1,400,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.85%    
Maturity date Mar. 15, 2044    
Senior Debt Obligations [Member] | EPO Senior Notes KK [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,150,000   1,150,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.10%    
Maturity date Feb. 15, 2045    
Senior Debt Obligations [Member] | EPO Senior Notes QQ [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 975,000   975,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.90%    
Maturity date May 15, 2046    
Senior Debt Obligations [Member] | EPO Senior Notes UU [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250,000   0
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.25%    
Maturity date Feb. 15, 2048    
Aggregate debt principal issued $ 1,250,000    
Debt issued as percent of principal amount 99.865%    
Senior Debt Obligations [Member] | EPO Senior Notes NN [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 400,000   400,000
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.95%    
Maturity date Oct. 15, 2054    
Senior Debt Obligations [Member] | TEPPCO Senior Notes 4 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 300   300
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.65%    
Maturity date Apr. 15, 2018    
Senior Debt Obligations [Member] | TEPPCO Senior Notes 5 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 400   400
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 7.55%    
Maturity date Apr. 15, 2038    
Junior Debt Obligations [Member]      
Debt Obligations Terms:      
Aggregate debt principal issued $ 700,000    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member]      
Debt Instrument [Line Items]      
Principal outstanding [1] $ 521,100   521,100
Debt Obligations Terms:      
Interest rate terms [1] variable    
Maturity date Aug. 31, 2066    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate 3.708%    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 5.34%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 5.08%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 5.48%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member]      
Debt Instrument [Line Items]      
Principal outstanding [2] $ 256,400   256,400
Debt Obligations Terms:      
Interest rate terms variable    
Maturity date Jun. 01, 2067    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate 2.778%    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 4.44%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 4.26%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 4.78%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member]      
Debt Instrument [Line Items]      
Principal outstanding [3] $ 0   682,700
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Maturity date Jan. 15, 2068    
Repayment of debt obligations $ 682,700    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D [Member]      
Debt Instrument [Line Items]      
Principal outstanding [4] $ 700,000   700,000
Debt Obligations Terms:      
Interest rate terms [4] fixed/variable    
Interest rate, stated percentage 4.875%    
Maturity date Aug. 16, 2077    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate 2.986%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes E [Member]      
Debt Instrument [Line Items]      
Principal outstanding [5] $ 1,000,000   1,000,000
Debt Obligations Terms:      
Interest rate terms [5] fixed/variable    
Interest rate, stated percentage 5.25%    
Maturity date Aug. 16, 2077    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate 3.033%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes F [Member]      
Debt Instrument [Line Items]      
Principal outstanding [6] $ 700,000   0
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Interest rate, stated percentage 5.375%    
Maturity date Feb. 15, 2078    
Aggregate debt principal issued $ 700,000    
Debt issued as percent of principal amount 100.00%    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate 2.57%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 14,200   $ 14,200
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Maturity date Jun. 01, 2067    
[1] Variable rate is reset quarterly and based on 3-month LIBOR plus 3.708%.
[2] Variable rate is reset quarterly and based on 3-month LIBOR plus 2.778%.
[3] Notes were redeemed in March 2018.
[4] Fixed rate of 4.875% through August 15, 2022; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 2.986%.
[5] Fixed rate of 5.250% through August 15, 2027; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 3.033%.
[6] Fixed rate of 5.375% through February 14, 2028; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 2.57%.