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Investments Equity investments (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Investments |  | $ 7,917.0 | $ 7,759.0 |
Earnings (Loss) from Equity Investments |  | 780.0 | 101.0 | $ 617.0
Amortization of excess cost of equity investments |  | (140.0) | (83.0) | (95.0)
Issuances of debt |  | $ 3,888.0 | 8,036.0 | 14,751.0
Citrus Corporation |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 1,849.0 | 1,856.0 |
Earnings (Loss) from Equity Investments |  | $ 165.0 | 157.0 | 169.0
SNG |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 1,532.0 | 1,473.0 |
Earnings (Loss) from Equity Investments |  | $ 129.0 | 140.0 | 141.0
NGPL Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 803.0 | 721.0 |
Earnings (Loss) from Equity Investments |  | 116.0 | 81.0 | 66.0
Notes Receivable, Related Parties, Noncurrent |  | $ 500.0 |  |
Issuances of debt | $ 500.0 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.75% |  |
NGPL Holdings, LLC | Earnings from Equity Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Interest |  | $ 34.0 | 8.0 |
Gulf Coast Express LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 34.00% |  |
Equity Investments |  | $ 638.0 | 656.0 |
Earnings (Loss) from Equity Investments |  | $ 90.0 | 37.0 | 2.0
Permian Highway Pipeline |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 27.00% |  |
Equity Investments |  | $ 632.0 | 309.0 |
Earnings (Loss) from Equity Investments |  | $ 0.0 | 0.0 | 0.0
MEP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 416.0 | 439.0 |
Earnings (Loss) from Equity Investments |  | $ (6.0) | 15.0 | 31.0
Gulf LNG Holdings Group LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 361.0 | 361.0 |
Earnings (Loss) from Equity Investments |  | $ 19.0 | 17.0 | (61.0)
Impairments of equity investments |  |  |  | 270.0
Plantation Pipe Line Company |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 51.00% |  |
Equity Investments |  | $ 357.0 | 348.0 |
Earnings (Loss) from Equity Investments |  | $ 43.0 | 58.0 | 55.0
Utopia Holding L.L.C. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 329.0 | 335.0 |
Earnings (Loss) from Equity Investments |  | $ 20.0 | 20.0 | 14.0
EagleHawk |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 25.00% |  |
Equity Investments |  | $ 275.0 | 285.0 |
Earnings (Loss) from Equity Investments |  | 17.0 | 17.0 | 7.0
Watco Companies, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Investments |  | 70.0 | 185.0 |
Earnings (Loss) from Equity Investments |  | $ 16.0 | 19.0 | 21.0
Watco Companies, LLC | Preferred Class B |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Common Unit, Issued |  | 50,000 |  |
Quarterly preferred distribution rate |  | 3.00% |  |
Watco Companies, LLC | Other, Net |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain (Loss) on Sale of Equity Investments |  | $ 10.0 |  |
Cortez Pipeline Company |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 53.00% |  |
Equity Investments |  | $ 25.0 | 26.0 |
Earnings (Loss) from Equity Investments |  | $ 24.0 | 35.0 | 36.0
FEP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 16.0 | 102.0 |
Earnings (Loss) from Equity Investments |  | $ 70.0 | 59.0 | 55.0
Ruby |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Interest |  | 50.00% |  |
Equity Investments |  | $ 1.0 | 41.0 |
Earnings (Loss) from Equity Investments |  | 15.0 | (609.0) | 26.0
Impairments of equity investments |  |  | 650.0 |
All others |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Investments |  | 613.0 | 622.0 |
Earnings (Loss) from Equity Investments |  | $ 62.0 | $ 55.0 | $ 55.0

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