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Debt Obligations (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 28, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding |  |  | $ 29,801 |  | $ 29,821
Other, non-principal amounts |  |  | (283) |  | (286)
Less current maturities of debt |  |  | (2,629) |  | (1,400)
Total long-term debt |  |  | 26,889 |  | 28,135
Debt Obligations Terms: |  |  |  |  |
Repayment of debt obligations |  |  | 13,464 | $ 8,742 |
Letters of credit outstanding |  |  | 100 |  |
Delayed Draw Term Loan [Member] |  |  |  |  |
Debt Obligations Terms: |  |  |  |  |
Maximum borrowing capacity |  |  | 500 |  |
Senior Debt Obligations [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding |  |  | 27,155 |  | 27,175
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal outstanding |  |  | $ 1,380 |  | 0
Information regarding variable interest rates paid: |  |  |  |  |
Weighted-average interest rate paid |  |  | 0.50% |  |
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 |  |  | 0.98% |  |
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 |  |  | 3.07% |  |
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 |  |  | 3.30% |  |
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 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 |  |  | 3.07% |  |
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 |  |  | 3.30% |  |
[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%.

X
- Definition The amount outstanding on a letter of credit. These letters of credit reduce the amount available for borrowing under EPO's Multi-Year Revolving Credit Facility. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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