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PROPERTY, PLANT AND EQUIPMENT - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 22,051,492 $ 18,030,963  
Accumulated depreciation and amortization (3,702,807) (3,264,312)  
Net property, plant and equipment 18,348,685 14,766,651  
Construction in Progress Expenditures Incurred but Not yet Paid 544,800 388,300 $ 92,400
Impairment of long-lived assets 0 0 $ 15,970
Non-Regulated Property, Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization (2,471,649) (2,168,855)  
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 4,316,936 3,851,043  
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 4,439,332 4,171,072  
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 684,635 656,455  
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 54 years    
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 797,678 782,258  
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 54 years    
Non-Regulated Property, Plant and Equipment [Member] | General plant and other      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 610,013 547,424  
Non-Regulated Property, Plant and Equipment [Member] | General plant and other | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Non-Regulated Property, Plant and Equipment [Member] | General plant and other | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 60 years    
Non-Regulated Property, Plant and Equipment [Member] | Construction work in process      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 1,645,663 797,182  
Regulated Property Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization $ (1,231,158) $ (1,095,457)  
Regulated Property Plant and Equipment [Member] | Natural Gas Liquids      
Property, Plant and Equipment [Line Items]      
Average Depreciation Rate 2.00% 1.90% 1.90%
Regulated Property Plant and Equipment [Member] | Natural Gas Pipelines      
Property, Plant and Equipment [Line Items]      
Average Depreciation Rate 2.10% 2.10% 2.10%
Regulated Property Plant and Equipment [Member] | Storage and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 9,180 $ 8,987  
Regulated Property Plant and Equipment [Member] | Storage and related equipment | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Regulated Property Plant and Equipment [Member] | Storage and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 25 years    
Regulated Property Plant and Equipment [Member] | General plant and other      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 66,507 61,136  
Regulated Property Plant and Equipment [Member] | General plant and other | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Regulated Property Plant and Equipment [Member] | General plant and other | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 50 years    
Regulated Property Plant and Equipment [Member] | Construction work in process      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 1,802,946 1,002,018  
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 1,552,546 1,475,789  
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 77 years    
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 6,126,056 $ 4,677,599  
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 88 years