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PROPERTY, PLANT AND EQUIPMENT - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 23,820,539 $ 23,072,935  
Accumulated depreciation and amortization (4,500,665) (3,918,007)  
Net property, plant and equipment 19,319,874 19,154,928  
Construction in Progress Expenditures Incurred but Not yet Paid 130,500 151,700 $ 544,800
Amortization expense for intangible assets 10,400 10,800 $ 11,900
Natural Gas Liquids      
Property, Plant and Equipment [Line Items]      
Impairment charges   71,600  
Natural Gas Gathering And Processing      
Property, Plant and Equipment [Line Items]      
Impairment charges   362,300  
Non-Regulated Property, Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization (2,885,020) (2,514,328)  
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 4,371,936 4,143,752  
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 $ 5,356,508 5,084,802  
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 $ 874,522 798,785  
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 $ 886,343 810,434  
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 $ 695,117 647,675  
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 $ 1,132,961 1,265,736  
Regulated Property Plant and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization $ (1,615,645) $ (1,403,679)  
Regulated Property Plant and Equipment [Member] | Natural Gas Liquids      
Property, Plant and Equipment [Line Items]      
Average Depreciation Rate 2.20% 2.20% 2.00%
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 $ 9,197 $ 9,180  
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] | Natural gas transmission pipelines and related equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 1,660,034 1,569,268  
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 $ 8,595,968 8,423,544  
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    
Regulated Property Plant and Equipment [Member] | General plant and other      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment $ 73,449 72,535  
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 $ 164,504 $ 247,224