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Debt Obligations (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Jan. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2021 | Apr. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 30,146.4 |  | $ 30,146.4 |  |  |  | $ 27,878.4
Other, non-principal amounts |  |  |  | (284.4) |  | (284.4) |  |  |  | (253.3)
Less current maturities of debt |  |  |  | (1,325.0) |  | (1,325.0) |  |  |  | (1,981.9)
Total long-term debt |  |  |  | 28,537.0 |  | 28,537.0 |  |  |  | 25,643.2
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Borrowings under debt agreements |  |  |  |  |  | 6,672.1 | $ 44,629.6 |  |  |
Repayment of debt obligations |  |  |  |  |  | 4,406.6 | $ 42,855.3 |  |  |
Letters of credit outstanding |  |  |  | 200.7 |  | 200.7 |  |  |  |
Senior Debt Obligations [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | 27,500.0 |  | 27,500.0 |  |  |  | 25,232.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Aggregate debt principal issued |  | $ 1,250.0 | $ 3,000.0 |  |  |  |  |  |  |
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.0 |  | $ 0.0 |  |  |  | 482.0
Information regarding variable interest rates paid: |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate paid |  |  |  |  |  | 1.86% |  |  |  |
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 1.78% |  | 1.78% |  |  |  |
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 2.08% |  | 2.08% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes Q, due January 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.0 |  | $ 0.0 |  |  |  | 500.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.25% |  | 5.25% |  |  |  |
Repayment of debt obligations |  |  |  |  |  | $ 500.0 |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes Y , due September 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.0 |  | $ 0.0 |  |  |  | 1,000.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.20% |  | 5.20% |  |  |  |
Repayment of debt obligations |  |  |  |  |  | $ 1,000.0 |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes TT, due February 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 750.0 |  | $ 750.0 |  |  |  | 750.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 2.80% |  | 2.80% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes TT, due February 2021 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Repayment of debt obligations |  |  |  |  |  |  |  | $ 750.0 |  |
Senior Debt Obligations [Member] | EPO Senior Notes RR, due April 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 575.0 |  | $ 575.0 |  |  |  | 575.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 2.85% |  | 2.85% |  |  |  |
Senior Debt Obligations [Member] | April 2020 EPO 364-Day Revolving Credit Agreement, due April 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 1,000.0 |
Senior Debt Obligations [Member] | September 2020 EPO 364 Day Credit Agreement, due September 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.0 |  | $ 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. |  |  |  |
Maximum borrowing capacity |  |  |  | 1,500.0 |  | $ 1,500.0 |  |  |  |
Maximum bank commitments increase |  |  |  | 200.0 |  | 200.0 |  |  |  |
Total maximum borrowing capacity |  |  |  | 1,700.0 |  | 1,700.0 |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes VV, due February 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 750.0 |  | $ 750.0 |  |  |  | 750.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.50% |  | 3.50% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes CC, due February 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 650.0 |  | $ 650.0 |  |  |  | 650.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.05% |  | 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 |  |  |  | 1,250.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.35% |  | 3.35% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes JJ, due February 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 850.0 |  | $ 850.0 |  |  |  | 850.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.90% |  | 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 |  |  |  | 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 |  |  |  | 1,150.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.75% |  | 3.75% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes PP, due February 2026 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 875.0 |  | $ 875.0 |  |  |  | 875.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.70% |  | 3.70% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes SS, due February 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 575.0 |  | $ 575.0 |  |  |  | 575.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.95% |  | 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 |  |  |  | 1,000.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.15% |  | 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 |  |  |  | 1,250.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.125% |  | 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 |  |  |  | 0.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 2.80% |  | 2.80% |  |  |  |
Aggregate debt principal issued |  |  |  | $ 250.0 | $ 1,000.0 |  |  |  |  |
Debt issued as percent of principal amount |  |  |  | 107.211% | 99.921% |  |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes D, due March 2033 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 500.0 |  | $ 500.0 |  |  |  | 500.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.875% |  | 6.875% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes H, due October 2034 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 350.0 |  | $ 350.0 |  |  |  | 350.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.65% |  | 6.65% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes J, due March 2035 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 250.0 |  | $ 250.0 |  |  |  | 250.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.75% |  | 5.75% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes W, due April 2038 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 399.6 |  | $ 399.6 |  |  |  | 399.6
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 7.55% |  | 7.55% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes R, due October 2039 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 600.0 |  | $ 600.0 |  |  |  | 600.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.125% |  | 6.125% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes Z, due September 2040 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 600.0 |  | $ 600.0 |  |  |  | 600.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.45% |  | 6.45% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes BB, due February 2041 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 750.0 |  | $ 750.0 |  |  |  | 750.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.95% |  | 5.95% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes DD, due February 2042 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 600.0 |  | $ 600.0 |  |  |  | 600.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.70% |  | 5.70% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes EE, due August 2042 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 750.0 |  | $ 750.0 |  |  |  | 750.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.85% |  | 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 |  |  |  | 1,100.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.45% |  | 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 |  |  |  | 1,400.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.85% |  | 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 |  |  |  | 1,150.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.10% |  | 5.10% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes QQ , due May 2046 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 975.0 |  | $ 975.0 |  |  |  | 975.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.90% |  | 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 |  |  |  | 1,250.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.25% |  | 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 |  |  |  | 1,250.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.80% |  | 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 |  |  |  | 1,250.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.20% |  | 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 |  |  |  | 0.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.70% |  | 3.70% |  |  |  |
Aggregate debt principal issued |  |  |  |  |  | $ 1,000.0 |  |  |  |
Debt issued as percent of principal amount |  |  |  |  |  | 99.413% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes DDD, due February 2052 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,000.0 |  | $ 1,000.0 |  |  |  | 0.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.20% |  | 3.20% |  |  |  |
Aggregate debt principal issued |  |  |  |  |  | $ 1,000.0 |  |  |  |
Debt issued as percent of principal amount |  |  |  |  |  | 99.233% |  |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes NN, due October 2054 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 400.0 |  | $ 400.0 |  |  |  | 400.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.95% |  | 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 |  |  |  | 0.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 3.95% |  | 3.95% |  |  |  |
Aggregate debt principal issued |  |  |  |  |  | $ 1,000.0 |  |  |  |
Debt issued as percent of principal amount |  |  |  |  |  | 99.36% |  |  |  |
Senior Debt Obligations [Member] | TEPPCO Senior Notes, due April 2038 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.4 |  | $ 0.4 |  |  |  | 0.4
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 7.55% |  | 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 |  |  |  | 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 |  |  |  |  |  | 3.87% |  |  |  |
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 |  |  |  | 3.02% |  | 3.02% |  |  |  |
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 |  |  |  | 4.68% |  | 4.68% |  |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D, due August 2077 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal outstanding | [2] |  |  | $ 700.0 |  | $ 700.0 |  |  |  | 700.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.875% |  | 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 |  |  |  | 1,000.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.25% |  | 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 |  |  |  | 700.0
Debt Obligations Terms: |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.375% |  | 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 |  |  |  | $ 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 |  |  |  |  |  | 3.87% |  |  |  |
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 3.02% |  | 3.02% |  |  |  |
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes, due June 2067 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 4.68% |  | 4.68% |  |  |  |
[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%.

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