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Debt Obligations (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Aug. 31, 2022
Feb. 28, 2022
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]            
Principal outstanding     $ 29,061     $ 29,821
Other, non-principal amounts     (280)     (286)
Less current maturities of debt     (1,889)     (1,400)
Total long-term debt     26,892     28,135
Debt Obligations Terms:            
Repayment of debt obligations     42,872 $ 11,122    
Letters of credit outstanding     117      
Delayed Draw Term Loan [Member]            
Debt Obligations Terms:            
Maximum borrowing capacity         $ 500  
Senior Debt Obligations [Member]            
Debt Instrument [Line Items]            
Principal outstanding     26,415     27,175
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 640     0
Information regarding variable interest rates paid:            
Weighted-average interest rate paid     0.72%      
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member]            
Information regarding variable interest rates paid:            
Variable interest rates paid     0.20%      
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member]            
Information regarding variable interest rates paid:            
Variable interest rates paid     1.85%      
Senior Debt Obligations [Member] | EPO Senior Notes VV, due February 2022 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 0     750
Debt Obligations Terms:            
Interest rate, stated percentage     3.50%      
Repayment of debt obligations   $ 750        
Senior Debt Obligations [Member] | EPO Senior Notes CC, due February 2022 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 0     650
Debt Obligations Terms:            
Interest rate, stated percentage     4.05%      
Repayment of debt obligations   $ 650        
Senior Debt Obligations [Member] | September 2021 EPO 364-Day Revolving Credit Agreement, due September 2022 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 0     0
Debt Obligations Terms:            
Credit facility interest rate description     LIBOR, plus an additional variable spread; or (ii) an alternate base rate, which is the greatest 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) LIBOR for an interest period of one month 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 HH, due March 2023 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 1,250     1,250
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     850
Debt Obligations Terms:            
Interest rate, stated percentage     3.90%      
Senior Debt Obligations [Member] | EPO Senior Notes MM, due February 2025 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 1,150     1,150
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     875
Debt Obligations Terms:            
Interest rate, stated percentage     3.70%      
Senior Debt Obligations [Member] | September 2021 EPO Multi-Year Revolving Credit Agreement, due September 2026 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 0     0
Debt Obligations Terms:            
Credit facility interest rate description     LIBOR, plus an additional variable spread; or (ii) an alternate base rate, which is the greatest 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) LIBOR for an interest period of one month 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 SS, due February 2027[Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 575     575
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     1,000
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     1,250
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     1,250
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     500
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     350
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     250
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     $ 400     400
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     600
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     600
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     750
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     600
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     750
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     1,100
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     1,400
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     1,150
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     975
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     1,250
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     1,250
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     1,250
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     1,000
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     1,000
Debt Obligations Terms:            
Interest rate, stated percentage     3.20%      
Senior Debt Obligations [Member] | EPO Senior Notes EEE, due February 2053 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 1,000     1,000
Debt Obligations Terms:            
Interest rate, stated percentage     3.30%      
Senior Debt Obligations [Member] | EPO Senior Notes NN, due October 2054 [Member]            
Debt Instrument [Line Items]            
Principal outstanding     $ 400     400
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     1,000
Debt Obligations Terms:            
Interest rate, stated percentage     3.95%      
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C, due June 2067 [Member]            
Debt Instrument [Line Items]            
Principal outstanding [1]     $ 232     232
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     3.36%      
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     2.95%      
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     4.36%      
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D, due August 2077 [Member]            
Debt Instrument [Line Items]            
Principal outstanding [2]     $ 700     700
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 D, due August 2077 [Member] | Forecast [Member]            
Debt Obligations Terms:            
Repayment of debt obligations $ 350          
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes E, due August 2077 [Member]            
Debt Instrument [Line Items]            
Principal outstanding [3]     $ 1,000     1,000
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     700
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     $ 14
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     3.36%      
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Minimum [Member]            
Information regarding variable interest rates paid:            
Variable interest rates paid     2.95%      
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Maximum [Member]            
Information regarding variable interest rates paid:            
Variable interest rates paid     4.36%      
[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%.