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Debt Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Principal outstanding $ 26,420,600 $ 24,780,100  
Other, non-principal amounts (242,400) (211,400)  
Less current maturities of debt (1,500,100) (2,855,000)  
Total long-term debt 24,678,100 21,713,700  
Debt Obligations Terms:      
Repayment of debt obligations 77,957,100 68,459,600 $ 61,672,600
Letters of credit outstanding for facilities and motor fuel tax obligations 101,400    
Senior Debt Obligations [Member]      
Debt Instrument [Line Items]      
Principal outstanding 23,750,000 21,605,700  
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0 1,755,700  
Debt Obligations Terms:      
Interest rate terms variable    
Maximum borrowing capacity $ 3,000,000 2,500,000  
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 2.24%    
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 $ 0 349,700  
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 $ 0 750,000  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 1.65%    
Maturity date May 07, 2018    
Senior Debt Obligations [Member] | EPO 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 364-Day Revolving Credit Agreement [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0 0  
Debt Obligations Terms:      
Interest rate terms variable    
Maturity date Sep. 11, 2019    
Maximum borrowing capacity $ 2,000,000    
Maximum bank commitments increase 200,000    
Total maximum borrowing capacity 2,200,000    
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 VV [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750,000 0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.50%    
Maturity date Feb. 01, 2022    
Aggregate debt principal issued $ 750,000    
Debt issued as percent of principal amount 99.985%    
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    
Maximum borrowing capacity $ 4,000,000    
Maximum bank commitments increase 500,000    
Total maximum borrowing capacity $ 4,500,000    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 3.37%    
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 5.00%    
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 WW [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,000,000 0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.15%    
Maturity date Oct. 16, 2028    
Aggregate debt principal issued $ 1,000,000    
Debt issued as percent of principal amount 99.764%    
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 XX [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250,000 0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.80%    
Maturity date Feb. 01, 2049    
Aggregate debt principal issued $ 1,250,000    
Debt issued as percent of principal amount 99.39%    
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 $ 0 300  
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 1,700,000  
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0 521,100  
Debt Obligations Terms:      
Interest rate terms variable    
Repayment of debt obligations $ 521,100    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 5.71%    
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 6.07%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member]      
Debt Instrument [Line Items]      
Principal outstanding [1] $ 256,400 256,400  
Debt Obligations Terms:      
Interest rate terms variable    
Interest rate, stated percentage 7.00%    
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 4.91%    
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 5.52%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0 682,700  
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Repayment of debt obligations $ 682,700    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 7.03%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 7.03%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 7.03%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D [Member]      
Debt Instrument [Line Items]      
Principal outstanding [2] $ 700,000 700,000  
Debt Obligations Terms:      
Interest rate terms 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 [3] $ 1,000,000 1,000,000  
Debt Obligations Terms:      
Interest rate terms 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 [4] $ 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 variable    
Maturity date Jun. 01, 2067    
Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 23,750,000    
Debt Obligations Terms:      
Aggregate debt principal issued $ 5,000,000   $ 1,250,000
[1] Variable rate is reset quarterly and based on 3-month LIBOR plus 2.778%.
[2] Fixed rate of 4.875% through August 15, 2022; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 2.986%.
[3] Fixed rate of 5.250% through August 15, 2027; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 3.033%.
[4] Fixed rate of 5.375% through February 14, 2028; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 2.57%.