Debt Obligations (Details) - USD ($) $ in Millions		1 Months Ended		9 Months Ended
		Mar. 31, 2023	Jan. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Principal outstanding				$ 29,191		$ 28,566
Other, non-principal amounts				(275)		(271)
Less current maturities of debt				(1,470)		(1,744)
Total long-term debt				27,446		26,551
Debt Obligations Terms:
Repayment of debt obligations				57,062	$ 64,828
Letters of credit outstanding				152
Senior Debt Obligations [Member]
Debt Instrument [Line Items]
Principal outstanding				26,895		26,270
Debt Obligations Terms:
Aggregate debt principal issued			$ 1,750
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]
Debt Instrument [Line Items]
Principal outstanding				$ 620		495
Information regarding variable interest rates paid:
Weighted-average interest rate paid				5.34%
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member]
Information regarding variable interest rates paid:
Variable interest rates paid				4.59%
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member]
Information regarding variable interest rates paid:
Variable interest rates paid				5.56%
Senior Debt Obligations [Member] | EPO Senior Notes HH, due March 2023 [Member]
Debt Instrument [Line Items]
Principal outstanding				$ 0		1,250
Debt Obligations Terms:
Interest rate, stated percentage				3.35%
Repayment of debt obligations		$ 1,250
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] | March 2023 $1.5 Billion EPO 364-Day Revolving Credit Agreement, due March 2024 [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 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 FFF, due January 2026 [Member]
Debt Instrument [Line Items]
Principal outstanding				$ 750		0
Debt Obligations Terms:
Interest rate, stated percentage				5.05%
Aggregate debt principal issued			$ 750
Debt issued as percent of principal amount			99.893%
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 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		0
Debt Obligations Terms:
Interest rate, stated percentage				5.35%
Aggregate debt principal issued			$ 1,000
Debt issued as percent of principal amount			99.803%
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	[3],[4]			$ 232		232
Debt Obligations Terms:
Variable rate, Interest rate terms				As a result of the LIBOR Act, our Junior Subordinated Notes C and D and the TEPPCO Junior Subordinated Notes, which were subject to a variable rate (as defined by the applicable agreement) based on three-month LIBOR (in each case, a “LIBOR Rate”) through June 30, 2023, replaced the applicable LIBOR Rate with a variable rate based on the three-month CME Term SOFR as administered by the CME Group Benchmark Administration, Ltd. plus a 0.26161% tenor spread adjustment beginning on July 1, 2023.
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				7.95%
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				7.54%
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				8.45%
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 rate, Interest rate terms				As a result of the LIBOR Act, our Junior Subordinated Notes C and D and the TEPPCO Junior Subordinated Notes, which were subject to a variable rate (as defined by the applicable agreement) based on three-month LIBOR (in each case, a “LIBOR Rate”) through June 30, 2023, replaced the applicable LIBOR Rate with a variable rate based on the three-month CME Term SOFR as administered by the CME Group Benchmark Administration, Ltd. plus a 0.26161% tenor spread adjustment beginning on July 1, 2023.
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				8.10%
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				7.63%
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				8.62%
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:
Variable rate, Interest rate terms				Additionally, our Junior Subordinated Notes E and F, which would have been subject to a variable rate (as defined by the applicable agreement) based on three-month LIBOR beginning in August 2027 and February 2028, respectively, will replace the applicable LIBOR Rate with the three-month CME Term SOFR plus a 0.26161% tenor spread adjustment.
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:
Variable rate, Interest rate terms				Additionally, our Junior Subordinated Notes E and F, which would have been subject to a variable rate (as defined by the applicable agreement) based on three-month LIBOR beginning in August 2027 and February 2028, respectively, will replace the applicable LIBOR Rate with the three-month CME Term SOFR plus a 0.26161% tenor spread adjustment.
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 rate, Interest rate terms				As a result of the LIBOR Act, our Junior Subordinated Notes C and D and the TEPPCO Junior Subordinated Notes, which were subject to a variable rate (as defined by the applicable agreement) based on three-month LIBOR (in each case, a “LIBOR Rate”) through June 30, 2023, replaced the applicable LIBOR Rate with a variable rate based on the three-month CME Term SOFR as administered by the CME Group Benchmark Administration, Ltd. plus a 0.26161% tenor spread adjustment beginning on July 1, 2023.
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				7.95%
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Minimum [Member]
Information regarding variable interest rates paid:
Variable interest rates paid				7.54%
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Maximum [Member]
Information regarding variable interest rates paid:
Variable interest rates paid				8.45%

[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, 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.  See discussion below in “Variable Interest Rates” regarding the LIBOR replacement and LIBOR replacement rate.

[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%.