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Debt Obligations (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 30, 2018 | Aug. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 24,780.1 | $ 23,901.6 |  |
Other, non-principal amounts |  |  |  | (211.4) | (203.9) |  |
Less current maturities of debt |  |  |  | (2,855.0) | (2,576.8) |  |
Total long-term debt |  |  |  | 21,713.7 | 21,120.9 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Repayment of debt obligations |  |  |  | 68,459.6 | 61,672.6 | $ 19,867.2 |
Letters of credit outstanding for facilities and motor fuel tax obligations |  |  |  | 66.4 |  |  |
Senior Debt Obligations [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | 21,605.7 | 22,427.2 |  |
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,755.7 | 1,777.2 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | variable |  |  |
Maximum borrowing capacity |  |  |  | $ 2,500.0 |  |  |
Repayment of debt obligations |  |  | $ 900.0 |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Weighted-average interest rate paid |  |  |  | 1.34% |  |  |
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 0.90% |  |  |
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 1.80% |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes L [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.0 | 800.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.30% |  |  |
Maturity date |  |  |  | Sep. 15, 2017 |  |  |
Repayment of debt obligations |  |  |  | $ 800.0 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes V [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 349.7 | 349.7 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.65% |  |  |
Maturity date |  |  |  | Apr. 15, 2018 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes OO [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 750.0 | 750.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 1.65% |  |  |
Maturity date |  |  |  | May 07, 2018 |  |  |
Senior Debt Obligations [Member] | EPO 364-Day Revolving Credit Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.0 | 0.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | variable |  |  |
Maturity date |  |  |  | Sep. 12, 2018 |  |  |
Maximum borrowing capacity |  |  |  | $ 1,500.0 |  |  |
Maximum bank commitments increase |  |  |  | 200.0 |  |  |
Total maximum borrowing capacity |  |  |  | 1,700.0 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes N [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 700.0 | 700.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.50% |  |  |
Maturity date |  |  |  | Jan. 31, 2019 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes LL [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 800.0 | 800.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 2.55% |  |  |
Maturity date |  |  |  | Oct. 15, 2019 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes Q [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 500.0 | 500.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 5.25% |  |  |
Maturity date |  |  |  | Jan. 31, 2020 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes Y [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,000.0 | 1,000.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 5.20% |  |  |
Maturity date |  |  |  | Sep. 01, 2020 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes RR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 575.0 | 575.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 2.85% |  |  |
Maturity date |  |  |  | Apr. 15, 2021 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes CC [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 650.0 | 650.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 4.05% |  |  |
Maturity date |  |  |  | Feb. 15, 2022 |  |  |
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.0 | 0.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | variable |  |  |
Maturity date |  |  |  | Sep. 13, 2022 |  |  |
Maximum borrowing capacity |  |  |  | $ 4,000.0 |  |  |
Maximum bank commitments increase |  |  |  | 500.0 |  |  |
Total maximum borrowing capacity |  |  |  | $ 4,500.0 |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Weighted-average interest rate paid |  |  |  | 2.23% |  |  |
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 2.23% |  |  |
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 2.23% |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes HH [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,250.0 | 1,250.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 3.35% |  |  |
Maturity date |  |  |  | Mar. 15, 2023 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes JJ [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 850.0 | 850.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 3.90% |  |  |
Maturity date |  |  |  | Feb. 15, 2024 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes MM [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,150.0 | 1,150.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 3.75% |  |  |
Maturity date |  |  |  | Feb. 15, 2025 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes PP [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 875.0 | 875.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 3.70% |  |  |
Maturity date |  |  |  | Feb. 15, 2026 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes SS [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 575.0 | 575.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 3.95% |  |  |
Maturity date |  |  |  | Feb. 15, 2027 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes D [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 500.0 | 500.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.875% |  |  |
Maturity date |  |  |  | Mar. 01, 2033 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes H [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 350.0 | 350.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.65% |  |  |
Maturity date |  |  |  | Oct. 15, 2034 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes J [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 250.0 | 250.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 5.75% |  |  |
Maturity date |  |  |  | Mar. 01, 2035 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes W [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 399.6 | 399.6 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 7.55% |  |  |
Maturity date |  |  |  | Apr. 15, 2038 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes R [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 600.0 | 600.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.125% |  |  |
Maturity date |  |  |  | Oct. 15, 2039 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes Z [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 600.0 | 600.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.45% |  |  |
Maturity date |  |  |  | Sep. 01, 2040 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes BB [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 750.0 | 750.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 5.95% |  |  |
Maturity date |  |  |  | Feb. 01, 2041 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes DD [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 600.0 | 600.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 5.70% |  |  |
Maturity date |  |  |  | Feb. 15, 2042 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes EE [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 750.0 | 750.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 4.85% |  |  |
Maturity date |  |  |  | Aug. 15, 2042 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes GG [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,100.0 | 1,100.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 4.45% |  |  |
Maturity date |  |  |  | Feb. 15, 2043 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes II [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,400.0 | 1,400.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 4.85% |  |  |
Maturity date |  |  |  | Mar. 15, 2044 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes KK [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 1,150.0 | 1,150.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 5.10% |  |  |
Maturity date |  |  |  | Feb. 15, 2045 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes QQ [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 975.0 | 975.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 4.90% |  |  |
Maturity date |  |  |  | May 15, 2046 |  |  |
Senior Debt Obligations [Member] | EPO Senior Notes NN [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 400.0 | 400.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 4.95% |  |  |
Maturity date |  |  |  | Oct. 15, 2054 |  |  |
Senior Debt Obligations [Member] | TEPPCO Senior Notes 4 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.3 | 0.3 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 6.65% |  |  |
Maturity date |  |  |  | Apr. 15, 2018 |  |  |
Senior Debt Obligations [Member] | TEPPCO Senior Notes 5 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 0.4 | 0.4 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed |  |  |
Interest rate, stated percentage |  |  |  | 7.55% |  |  |
Maturity date |  |  |  | Apr. 15, 2038 |  |  |
Junior Debt Obligations [Member] |  |  |  |  |  |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Aggregate debt principal issued |  |  |  | $ 1,700.0 |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding | [1] |  |  | $ 521.1 | 521.1 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | variable |  |  |
Interest rate, stated percentage | [2] |  |  |  |  |  | 8.375%
Maturity date |  |  |  | Aug. 31, 2066 |  |  |
Variable annual interest rate thereafter, variable rate basis | [3] |  |  | 3-month LIBOR |  |  |
Variable interest rate | [3] |  |  | 3.708% |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Weighted-average interest rate paid |  |  |  | 4.89% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member] | Minimum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 4.59% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member] | Maximum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 5.08% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding | [4] |  |  | $ 256.4 | 256.4 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed/variable |  |  |
Interest rate, stated percentage | [5] |  |  | 7.00% |  |  |
Maturity date |  |  |  | Jun. 01, 2067 |  |  |
Variable annual interest rate thereafter, variable rate basis | [6] |  |  | 3-month LIBOR |  |  |
Variable interest rate | [6] |  |  | 2.778% |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Weighted-average interest rate paid |  |  |  | 4.07% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member] | Minimum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 3.98% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member] | Maximum [Member] |  |  |  |  |  |  |
Information regarding variable interest rates paid: |  |  |  |  |  |  |
Variable interest rates paid |  |  |  | 4.26% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding | [7] |  |  | $ 682.7 | 682.7 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed/variable |  |  |
Interest rate, stated percentage | [8] |  |  | 7.034% |  |  |
Maturity date |  |  |  | Jan. 15, 2068 |  |  |
Variable annual interest rate thereafter, variable rate basis | [9] |  |  | 3-month LIBOR |  |  |
Variable interest rate | [9] |  |  | 2.68% |  |  |
Minimum variable annual interest rate | [9] |  |  | 7.034% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member] | Forecast [Member] |  |  |  |  |  |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Repayment of debt obligations |  | $ 682.7 |  |  |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes D [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding | [10] |  |  | $ 700.0 | 0.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed/variable |  |  |
Interest rate, stated percentage | [11] |  |  | 4.875% |  |  |
Maturity date |  |  |  | Aug. 16, 2077 |  |  |
Aggregate debt principal issued |  |  |  | $ 700.0 |  |  |
Debt issued as percent of principal amount |  |  |  | 100.00% |  |  |
Variable annual interest rate thereafter, variable rate basis | [12] |  |  | 3-month LIBOR |  |  |
Variable interest rate | [12] |  |  | 2.986% |  |  |
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes E [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding | [13] |  |  | $ 1,000.0 | 0.0 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed/variable |  |  |
Interest rate, stated percentage | [11] |  |  | 5.25% |  |  |
Maturity date |  |  |  | Aug. 16, 2077 |  |  |
Aggregate debt principal issued |  |  |  | $ 1,000.0 |  |  |
Debt issued as percent of principal amount |  |  |  | 100.00% |  |  |
Variable annual interest rate thereafter, variable rate basis | [14] |  |  | 3-month LIBOR |  |  |
Variable interest rate | [14] |  |  | 3.033% |  |  |
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 14.2 | 14.2 |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Interest rate terms |  |  |  | fixed/variable |  |  |
Maturity date |  |  |  | Jun. 01, 2067 |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal outstanding |  |  |  | $ 19,850.0 |  |  |
Debt Obligations Terms: |  |  |  |  |  |  |
Aggregate debt principal issued |  |  |  |  | $ 1,250.0 | $ 2,500.0 |
[1] | Variable rate is reset quarterly and based on 3-month LIBOR plus 3.708%.
[2] | Interest is payable semi-annually in arrears in February and August of each year, which commenced in February 2007.
[3] | Interest is payable quarterly in arrears in February, May, August and November of each, which commenced in November 2016.
[4] | Fixed rate of 7.000% through May 31, 2017; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 2.778%.
[5] | Interest is payable semi-annually in arrears in June and December of each year, which commenced in December 2009.
[6] | Interest is payable quarterly in arrears in March, June, September and December of each year, which commenced in September 2017.
[7] | Fixed rate of 7.034% through January 14, 2018; thereafter, the rate will be the greater of 7.034% or a variable rate reset quarterly and based on 3-month LIBOR plus 2.680%. These notes are expected to be redeemed in March 2018 (see Note 22).
[8] | Interest was payable semi-annually in arrears in January and July of each year, which commenced in January 2008.
[9] | Interest was payable quarterly in arrears in January, April, July and October of each year commencing in April 2018.
[10] | Fixed rate of 4.875% through August 15, 2022; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 2.986%.
[11] | Interest is payable semi-annually in arrears in February and August of each year, which commenced in February 2018.
[12] | Interest is payable quarterly in arrears in February, May, August and November of each year commencing in November 2022.
[13] | Fixed rate of 5.250% through August 15, 2027; thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 3.033%.
[14] | Interest is payable quarterly in arrears in February, May, August and November of each year commencing in November 2027.

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