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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