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Debt Obligations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Instrument [Line Items]      
Principal outstanding $ 28,936.4   $ 30,146.4
Other, non-principal amounts (277.1)   (280.7)
Less current maturities of debt (1,513.4)   (1,325.0)
Total long-term debt 27,145.9   28,540.7
Debt Obligations Terms:      
Repayment of debt obligations 8,741.8 $ 3,406.6  
Letters of credit outstanding 200.7    
Senior Debt Obligations [Member]      
Debt Instrument [Line Items]      
Principal outstanding 26,290.0   27,500.0
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 115.0   0.0
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 0.22%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 0.15%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 0.25%    
Senior Debt Obligations [Member] | EPO Senior Notes TT, due February 2021 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.0   750.0
Debt Obligations Terms:      
Interest rate, stated percentage 2.80%    
Repayment of debt obligations $ 750.0    
Senior Debt Obligations [Member] | EPO Senior Notes RR, due April 2021 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.0   575.0
Debt Obligations Terms:      
Interest rate, stated percentage 2.85%    
Repayment of debt obligations $ 575.0    
Senior Debt Obligations [Member] | September 2020 EPO 364-Day Revolving Credit Agreement, due September 2021 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.0   0.0
Debt Obligations Terms:      
Credit facility interest rate description (i) LIBOR, plus an additional variable spread; or (ii) an alternate base rate, which is the greater of (a) the Prime Rate in effect on such day, (b) the Federal Funds Effective Rate in effect on such day plus 0.5%, or (c) the LIBO Market Index Rate in effect on such day plus 1% and a variable spread. The applicable spreads are determined based on EPO's debt ratings.    
Senior Debt Obligations [Member] | EPO Senior Notes VV, due February 2022 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750.0   750.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.50%    
Senior Debt Obligations [Member] | EPO Senior Notes CC, due February 2022 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 650.0   650.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.05%    
Senior Debt Obligations [Member] | EPO Senior Notes HH, due March 2023 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250.0   1,250.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.35%    
Senior Debt Obligations [Member] | EPO Senior Notes JJ, due February 2024 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 850.0   850.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.90%    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Agreement, due September 2024 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.0   0.0
Debt Obligations Terms:      
Credit facility interest rate description (i) LIBOR, plus an additional variable spread; or (ii) an alternate base rate, which is the greater of (a) the Prime Rate in effect on such day, (b) the Federal Funds Effective Rate in effect on such day plus 0.5%, or (c) the LIBO Market Index Rate in effect on such day plus 1% and a variable spread. The applicable spreads are determined based on EPO's debt ratings.    
Senior Debt Obligations [Member] | EPO Senior Notes MM, due February 2025 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,150.0   1,150.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.75%    
Senior Debt Obligations [Member] | EPO Senior Notes PP, due February 2026 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 875.0   875.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.70%    
Senior Debt Obligations [Member] | EPO Senior Notes SS, due February 2027[Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 575.0   575.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.95%    
Senior Debt Obligations [Member] | EPO Senior Notes WW, due October 2028 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,000.0   1,000.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.15%    
Senior Debt Obligations [Member] | EPO Senior Notes YY, due July 2029 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250.0   1,250.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.125%    
Senior Debt Obligations [Member] | EPO Senior Notes AAA, due January 2030 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250.0   1,250.0
Debt Obligations Terms:      
Interest rate, stated percentage 2.80%    
Senior Debt Obligations [Member] | EPO Senior Notes D, due March 2033 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 500.0   500.0
Debt Obligations Terms:      
Interest rate, stated percentage 6.875%    
Senior Debt Obligations [Member] | EPO Senior Notes H, due October 2034 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 350.0   350.0
Debt Obligations Terms:      
Interest rate, stated percentage 6.65%    
Senior Debt Obligations [Member] | EPO Senior Notes J, due March 2035 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 250.0   250.0
Debt Obligations Terms:      
Interest rate, stated percentage 5.75%    
Senior Debt Obligations [Member] | EPO Senior Notes W, due April 2038 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 399.6   399.6
Debt Obligations Terms:      
Interest rate, stated percentage 7.55%    
Senior Debt Obligations [Member] | EPO Senior Notes R, due October 2039 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600.0   600.0
Debt Obligations Terms:      
Interest rate, stated percentage 6.125%    
Senior Debt Obligations [Member] | EPO Senior Notes Z, due September 2040 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600.0   600.0
Debt Obligations Terms:      
Interest rate, stated percentage 6.45%    
Senior Debt Obligations [Member] | EPO Senior Notes BB, due February 2041 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750.0   750.0
Debt Obligations Terms:      
Interest rate, stated percentage 5.95%    
Senior Debt Obligations [Member] | EPO Senior Notes DD, due February 2042 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600.0   600.0
Debt Obligations Terms:      
Interest rate, stated percentage 5.70%    
Senior Debt Obligations [Member] | EPO Senior Notes EE, due August 2042 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750.0   750.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.85%    
Senior Debt Obligations [Member] | EPO Senior Notes GG, due February 2043 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,100.0   1,100.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.45%    
Senior Debt Obligations [Member] | EPO Senior Notes II, due March 2044 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,400.0   1,400.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.85%    
Senior Debt Obligations [Member] | EPO Senior Notes KK, due February 2045 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,150.0   1,150.0
Debt Obligations Terms:      
Interest rate, stated percentage 5.10%    
Senior Debt Obligations [Member] | EPO Senior Notes QQ, due May 2046 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 975.0   975.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.90%    
Senior Debt Obligations [Member] | EPO Senior Notes UU, due February 2048 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250.0   1,250.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.25%    
Senior Debt Obligations [Member] | EPO Senior Notes XX, due February 2049 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250.0   1,250.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.80%    
Senior Debt Obligations [Member] | EPO Senior Notes ZZ, due January 2050 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250.0   1,250.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.20%    
Senior Debt Obligations [Member] | EPO Senior Notes BBB, due January 2051 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,000.0   1,000.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.70%    
Senior Debt Obligations [Member] | EPO Senior Notes DDD, due February 2052 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,000.0   1,000.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.20%    
Senior Debt Obligations [Member] | EPO Senior Notes NN, due October 2054 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 400.0   400.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.95%    
Senior Debt Obligations [Member] | EPO Senior Notes CCC, due January 2060 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,000.0   1,000.0
Debt Obligations Terms:      
Interest rate, stated percentage 3.95%    
Senior Debt Obligations [Member] | TEPPCO Senior Notes, due April 2038 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.4   0.4
Debt Obligations Terms:      
Interest rate, stated percentage 7.55%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C, due June 2067 [Member]      
Debt Instrument [Line Items]      
Principal outstanding [1] $ 232.2   232.2
Debt Obligations Terms:      
Variable annual interest rate thereafter, variable rate basis 3-month London Interbank Offered Rate ("LIBOR")    
Variable interest rate 2.778%    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 2.99%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C, due June 2067 [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 2.97%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C, due June 2067 [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 3.00%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D, due August 2077 [Member]      
Debt Instrument [Line Items]      
Principal outstanding [2] $ 700.0   700.0
Debt Obligations Terms:      
Interest rate, stated percentage 4.875%    
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, due August 2077 [Member]      
Debt Instrument [Line Items]      
Principal outstanding [3] $ 1,000.0   1,000.0
Debt Obligations Terms:      
Interest rate, stated percentage 5.25%    
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, due February 2078 [Member]      
Debt Instrument [Line Items]      
Principal outstanding [4] $ 700.0   700.0
Debt Obligations Terms:      
Interest rate, stated percentage 5.375%    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate 2.57%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member]      
Debt Instrument [Line Items]      
Principal outstanding [1] $ 14.2   $ 14.2
Debt Obligations Terms:      
Variable annual interest rate thereafter, variable rate basis 3-month London Interbank Offered Rate ("LIBOR")    
Variable interest rate 2.778%    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 2.99%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 2.97%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 3.00%    
[1] Variable rate is reset quarterly and based on 3-month London Interbank Offered Rate ("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%.