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Debt Obligations (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Feb. 28, 2025
Aug. 31, 2024
Feb. 29, 2024
Jan. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]              
Principal outstanding         $ 32,221   $ 29,021
Other, non-principal amounts         (316)   (273)
Less current maturities of debt         (1,149)   (1,300)
Total long-term debt         30,756   27,448
Debt Obligations Terms:              
Repayment of debt obligations         49,271 $ 57,062  
Letters of credit outstanding         28    
Senior Debt Obligations [Member]              
Debt Instrument [Line Items]              
Principal outstanding         29,925   26,725
Debt Obligations Terms:              
Aggregate debt principal issued   $ 2,500   $ 2,000      
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 0   450
Information regarding variable interest rates paid:              
Weighted-average interest rate paid         5.46%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member]              
Information regarding variable interest rates paid:              
Variable interest rates paid         5.45%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member]              
Information regarding variable interest rates paid:              
Variable interest rates paid         5.50%    
Senior Debt Obligations [Member] | EPO Senior Notes JJ, due February 2024 [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 0   850
Debt Obligations Terms:              
Interest rate, stated percentage         3.90%    
Repayment of debt obligations     $ 850        
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 MM, due February 2025 [Member] | Forecast [Member]              
Debt Obligations Terms:              
Repayment of debt obligations $ 1,150            
Senior Debt Obligations [Member] | March 2024 $1.5 Billion EPO 364-Day Revolving Credit Agreement, due March 2025 [Member]              
Debt Instrument [Line Items]              
Principal outstanding [1]         $ 0   0
Debt Obligations Terms:              
Credit facility interest rate description         SOFR, 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) Adjusted Term SOFR, 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.    
Maximum borrowing capacity         $ 1,500    
Maximum bank commitments increase         200    
Total maximum borrowing capacity         1,700    
Senior Debt Obligations [Member] | EPO Senior Notes FFF, due January 2026 [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 750   750
Debt Obligations Terms:              
Interest rate, stated percentage         5.05%    
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] | EPO Senior Notes HHH, due January 2027 [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 1,000   0
Debt Obligations Terms:              
Interest rate, stated percentage         4.60%    
Aggregate debt principal issued       $ 1,000      
Debt issued as percent of principal amount       99.897%      
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] | March 2023 $2.7 Billion EPO Multi-Year Revolving Credit Agreement, due March 2028 [Member]              
Debt Instrument [Line Items]              
Principal outstanding [2]         $ 0   0
Debt Obligations Terms:              
Credit facility interest rate description         SOFR, 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) Adjusted Term SOFR, 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.    
Maximum borrowing capacity         $ 2,700    
Maximum bank commitments increase         500    
Total maximum borrowing capacity         3,200    
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 GGG, due January 2033 [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 1,000   1,000
Debt Obligations Terms:              
Interest rate, stated percentage         5.35%    
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 III, due January 2034 [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 1,000   0
Debt Obligations Terms:              
Interest rate, stated percentage         4.85%    
Aggregate debt principal issued       $ 1,000      
Debt issued as percent of principal amount       99.705%      
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 JJJ, due February 2035 [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 1,100   0
Debt Obligations Terms:              
Interest rate, stated percentage         4.95%    
Aggregate debt principal issued   $ 1,100          
Debt issued as percent of principal amount   99.40%          
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 KKK, due February 2055 [Member]              
Debt Instrument [Line Items]              
Principal outstanding         $ 1,400   0
Debt Obligations Terms:              
Interest rate, stated percentage         5.55%    
Aggregate debt principal issued   $ 1,400          
Debt issued as percent of principal amount   99.663%          
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]              
Debt Obligations Terms:              
Variable rate, Interest rate terms         Effective July 1, 2023 and in accordance with the Adjustable Interest Rate (LIBOR) Act, all series of our junior subordinated notes subject to a variable interest rate replaced the 3-month London Interbank Offered Rate (“LIBOR”) with 3-month CME Term SOFR plus a 0.26161% tenor spread adjustment.    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C, due June 2067 [Member]              
Debt Instrument [Line Items]              
Principal outstanding [3],[4]         $ 232   232
Debt Obligations Terms:              
Variable annual interest rate thereafter, variable rate basis         3-month Chicago Mercantile Exchange (“CME”) Term Secured Overnight Financing Rate (“SOFR”) plus (a) a 0.26161% tenor spread adjustment    
Variable interest rate         2.778%    
Information regarding variable interest rates paid:              
Weighted-average interest rate paid         8.35%    
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         8.06%    
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         8.42%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D, due August 2077 [Member]              
Debt Instrument [Line Items]              
Principal outstanding [3],[5]         $ 350   350
Debt Obligations Terms:              
Variable annual interest rate thereafter, variable rate basis         3-month CME Term SOFR plus (a) a 0.26161% tenor spread adjustment    
Variable interest rate         2.986%    
Information regarding variable interest rates paid:              
Weighted-average interest rate paid         8.55%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D, due August 2077 [Member] | Minimum [Member]              
Information regarding variable interest rates paid:              
Variable interest rates paid         8.34%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D, due August 2077 [Member] | Maximum [Member]              
Information regarding variable interest rates paid:              
Variable interest rates paid         8.64%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes E, due August 2077 [Member]              
Debt Instrument [Line Items]              
Principal outstanding [3],[6]         $ 1,000   1,000
Debt Obligations Terms:              
Interest rate, stated percentage         5.25%    
Variable annual interest rate thereafter, variable rate basis         3-month CME Term SOFR plus (a) a 0.26161% tenor spread adjustment    
Variable interest rate         3.033%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes F, due February 2078 [Member]              
Debt Instrument [Line Items]              
Principal outstanding [3],[7]         $ 700   700
Debt Obligations Terms:              
Interest rate, stated percentage         5.375%    
Variable annual interest rate thereafter, variable rate basis         3-month CME Term SOFR plus (a) a 0.26161% tenor spread adjustment    
Variable interest rate         2.57%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member]              
Debt Instrument [Line Items]              
Principal outstanding [3],[4]         $ 14   $ 14
Debt Obligations Terms:              
Variable annual interest rate thereafter, variable rate basis         3-month Chicago Mercantile Exchange (“CME”) Term Secured Overnight Financing Rate (“SOFR”) plus (a) a 0.26161% tenor spread adjustment    
Variable interest rate         2.778%    
Information regarding variable interest rates paid:              
Weighted-average interest rate paid         8.35%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Minimum [Member]              
Information regarding variable interest rates paid:              
Variable interest rates paid         8.06%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Maximum [Member]              
Information regarding variable interest rates paid:              
Variable interest rates paid         8.42%    
[1] Under the terms of the agreement, EPO may borrow up to $1.5 billion (which may be increased by up to $200 million to $1.7 billion at EPO’s election provided certain conditions are met).
[2] Under the terms of the agreement, EPO may borrow up to $2.7 billion (which may be increased by up to $500 million to $3.2 billion at EPO’s election provided certain conditions are met).
[3] Effective July 1, 2023 and in accordance with the Adjustable Interest Rate (LIBOR) Act, all series of our junior subordinated notes subject to a variable interest rate replaced the 3-month London Interbank Offered Rate (“LIBOR”) with 3-month CME Term SOFR plus a 0.26161% tenor spread adjustment. 
[4] Variable rate is reset quarterly and based on 3-month Chicago Mercantile Exchange (“CME”) Term Secured Overnight Financing Rate (“SOFR”) plus (a) a 0.26161% tenor spread adjustment and (b) 2.778%.
[5] Variable rate is reset quarterly and based on 3-month CME Term SOFR plus (a) a 0.26161% tenor spread adjustment and (b) 2.986%.
[6] Fixed rate of 5.250% through August 15, 2027; thereafter, a variable rate reset quarterly and based on 3-month CME Term SOFR plus (a) a 0.26161% tenor spread adjustment and (b) 3.033%.
[7] Fixed rate of 5.375% through February 14, 2028; thereafter, a variable rate reset quarterly and based on 3-month CME Term SOFR plus (a) a 0.26161% tenor spread adjustment and (b) 2.57%.