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PROPERTY, PLANT AND EQUIPMENT - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 23,072,935	$ 22,051,492
Accumulated depreciation and amortization	(3,918,007)	(3,702,807)
Net property, plant and equipment	19,154,928	18,348,685
Construction in Progress Expenditures Incurred but Not yet Paid	151,700	544,800	$ 388,300
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	(2,514,328)	(2,471,649)
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 4,143,752	4,316,936
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	$ 5,084,802	4,439,332
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	$ 798,785	684,635
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	$ 810,434	797,678
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	$ 647,675	610,013
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	$ 1,265,736	1,645,663
Regulated Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (1,403,679)	$ (1,231,158)
Regulated Property Plant and Equipment [Member] | Natural Gas Liquids
Property, Plant and Equipment [Line Items]
Average Depreciation Rate	2.20%	2.00%	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	$ 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	$ 1,569,268	1,552,546
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	$ 8,423,544	6,126,056
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	$ 72,535	66,507
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	$ 247,224	$ 1,802,946

X

- Definition

The average depreciation percentage rate of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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