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PROPERTY, PLANT AND EQUIPMENT - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 18,030,963 $ 15,559,667  
Accumulated depreciation and amortization (3,264,312) (2,861,541)  
Property, Plant and Equipment, Net 14,766,651 12,698,126  
Construction in Progress Expenditures Incurred but Not yet Paid 388,300 92,400 $ 83,000
Impairment of long-lived assets 0 15,970 0
Equity Method Investment, Other than Temporary Impairment 0 4,270 $ 0
Non-Regulated Property, Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization (2,168,855) (1,888,010)  
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 3,851,043 3,613,344  
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, Gross $ 4,171,072 3,873,709  
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, Gross $ 656,455 604,656  
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, Gross $ 782,258 700,455  
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, Gross $ 547,424 504,610  
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, Gross $ 797,182 362,253  
Regulated Property Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization $ (1,095,457) $ (973,531)  
Regulated Property Plant and Equipment [Member] | Natural Gas Liquids      
Property, Plant and Equipment [Line Items]      
Average Depreciation Rate 1.90% 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, Gross $ 8,987 $ 12,486  
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, Gross $ 61,136 57,902  
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, Gross $ 1,002,018 83,044  
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 1,475,789 1,406,780  
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] | Natural gas liquids transmission pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 4,677,599 $ 4,340,428  
Regulated Property Plant and Equipment [Member] | Natural gas liquids 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 liquids transmission pipelines and related equipment | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 88 years