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SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment disclosure [Abstract]
Revenues	$ 1,660,729		$ 2,457,575		$ 3,797,401	$ 5,237,533
Cost of sales and fuel (exclusive of depreciation and operating costs)	(940,458)		(1,625,794)		(2,217,386)	(3,582,171)
Operating costs	(224,464)		(237,713)		(431,504)	(478,454)
Equity in net earnings (loss) from investments	25,328		34,118		69,955	77,599
Depreciation and amortization	(140,416)		(114,964)		(272,769)	(229,122)
Impairment charges	0		0		(641,754)	0
Total assets	22,992,467		19,751,594		22,992,467	19,751,594	$ 21,812,121
Capital expenditures	594,282		830,459		1,543,961	1,720,164
Equity Method Investments	790,035		881,084		790,035	881,084	$ 861,844
Net income (loss)	134,321	$ (141,857)	311,963	$ 337,208	(7,536)	649,171
Interest expense, net of capitalized interest	218,968		117,493		359,584	232,913
Income tax expense (benefit)	43,140		98,935		(12,255)	176,869
Noncash compensation expense	957		5,115		(345)	10,655
Other corporate costs and noncash items	(1,578)		(14,541)		(34,659)	(28,270)
Gain (loss) on extinguishment of debt	4,300				20,000
Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	299,809		582,180		749,789	1,276,841
Cost of sales and fuel (exclusive of depreciation and operating costs)	(132,221)		(309,745)		(334,391)	(760,658)
Operating costs	(78,668)		(85,762)		(163,138)	(180,009)
Equity in net earnings (loss) from investments	(2,149)		(1,621)		(1,343)	(2,823)
Noncash compensation expense and other	1,978		1,571		(2,520)	5,516
Segment adjusted EBITDA	88,749		186,623		248,397	338,867
Depreciation and amortization	(55,419)		(53,552)		(114,175)	(106,233)
Impairment charges					(564,353)
Total assets	6,426,121		6,343,968		6,426,121	6,343,968
Capital expenditures	118,171		213,222		299,781	428,370
Equity Method Investments	2,250		37,793		2,250	37,793
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member]
Segment disclosure [Abstract]
Revenues	108,200		317,900		321,500	653,700
Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	1,335,714		2,072,558		3,106,306	4,384,058
Cost of sales and fuel (exclusive of depreciation and operating costs)	(905,154)		(1,629,573)		(2,183,908)	(3,476,246)
Operating costs	(106,977)		(114,933)		(196,548)	(225,371)
Equity in net earnings (loss) from investments	7,797		15,972		23,065	33,516
Noncash compensation expense and other	6,262		2,738		(357)	8,444
Segment adjusted EBITDA	337,642		346,762		748,558	724,401
Depreciation and amortization	(69,065)		(46,346)		(126,906)	(92,747)
Impairment charges					(77,401)
Total assets	13,183,168		10,694,485		13,183,168	10,694,485
Capital expenditures	459,807		591,762		1,205,990	1,231,100
Equity Method Investments	427,032		443,104		427,032	443,104
Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	477,200		303,400		912,300	626,500
Cost of sales and fuel (exclusive of depreciation and operating costs)	(117,100)		(116,900)		(237,500)	(235,400)
Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	122,058		117,531		242,841	233,931
Cost of sales and fuel (exclusive of depreciation and operating costs)	(168)		(1,649)		(1,707)	(3,404)
Operating costs	(33,092)		(36,605)		(66,399)	(72,873)
Equity in net earnings (loss) from investments	19,680		19,767		48,233	46,906
Noncash compensation expense and other	1,355		1,500		(611)	2,632
Segment adjusted EBITDA	109,833		100,544		222,357	207,192
Depreciation and amortization	(14,925)		(14,167)		(29,694)	(28,323)
Impairment charges					0
Total assets	2,064,197		2,083,940		2,064,197	2,083,940
Capital expenditures	10,910		21,406		27,500	50,094
Equity Method Investments	360,753		400,187		360,753	400,187
Natural Gas Pipelines | Natural Gas Pipelines Regulated [Member]
Segment disclosure [Abstract]
Revenues	79,900		72,300		153,800	142,400
Cost of sales and fuel (exclusive of depreciation and operating costs)	(6,700)		(3,700)		(12,800)	(9,300)
Total Segments [Member]
Segment disclosure [Abstract]
Revenues	1,757,581		2,772,269		4,098,936	5,894,830
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,037,543)		(1,940,967)		(2,520,006)	(4,240,308)
Operating costs	(218,737)		(237,300)		(426,085)	(478,253)
Equity in net earnings (loss) from investments	25,328		34,118		69,955	77,599
Noncash compensation expense and other	9,595		5,809		(3,488)	16,592
Segment adjusted EBITDA	536,224		633,929		1,219,312	1,270,460
Depreciation and amortization	(139,409)		(114,065)		(270,775)	(227,303)
Impairment charges					(641,754)
Total assets	21,673,486		19,122,393		21,673,486	19,122,393
Capital expenditures	588,888		826,390		1,533,271	1,709,564
Equity Method Investments	790,035		881,084		790,035	881,084
Other and Eliminations
Segment disclosure [Abstract]
Revenues	(96,852)		(314,694)		(301,535)	(657,297)
Cost of sales and fuel (exclusive of depreciation and operating costs)	97,085		315,173		302,620	658,137
Operating costs	(5,727)		(413)		(5,419)	(201)
Equity in net earnings (loss) from investments	0		0		0	0
Depreciation and amortization	(1,007)		(899)		(1,994)	(1,819)
Impairment charges					0
Total assets	1,318,981		629,201		1,318,981	629,201
Capital expenditures	5,394		4,069		10,690	10,600
Equity Method Investments	0		0		0	0
Operating Segments [Member] | Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	432,600		267,300		810,800	537,300
Noncustomer [Domain]
Segment disclosure [Abstract]
Revenues	18,800		18,600		99,000	40,900
NGL and Condensate Sales [Member]
Segment disclosure [Abstract]
Revenues	1,195,194		1,923,794		2,812,350	4,075,878
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	109,581		312,757		329,498	645,089
NGL and Condensate Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,174,580		1,921,564		2,771,291	4,079,667
NGL and Condensate Sales [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0		0	0
NGL and Condensate Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,284,161		2,234,321		3,100,789	4,724,756
NGL and Condensate Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(88,967)		(310,527)		(288,439)	(648,878)
Residue Natural Gas Sales [Member]
Segment disclosure [Abstract]
Revenues	146,961		221,374		337,015	541,380
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	150,892		221,333		339,943	540,369
Residue Natural Gas Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0		0	0
Residue Natural Gas Sales [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		41		2,035	1,011
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	150,892		221,374		341,978	541,380
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(3,931)		0		(4,963)	0
Gathering, Processing and Exchange Services Revenue
Segment disclosure [Abstract]
Revenues	154,123		149,394		312,596	287,670
Gathering, Processing and Exchange Services Revenue | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	35,949		43,536		73,886	83,278
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	118,174		105,858		238,710	204,392
Gathering, Processing and Exchange Services Revenue | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0		0	0
Gathering, Processing and Exchange Services Revenue | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	154,123		149,394		312,596	287,670
Gathering, Processing and Exchange Services Revenue | Other and Eliminations
Segment disclosure [Abstract]
Revenues	0		0		0	0
Transportation and Storage Revenue [Member]
Segment disclosure [Abstract]
Revenues	159,031		156,015		324,341	317,265
Transportation and Storage Revenue [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		0		0	0
Transportation and Storage Revenue [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40,881		42,655		91,636	94,977
Transportation and Storage Revenue [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	121,777		117,240		240,141	230,105
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	162,658		159,895		331,777	325,082
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(3,627)		(3,880)		(7,436)	(7,817)
Other [Member]
Segment disclosure [Abstract]
Revenues	5,420		6,998		11,099	15,340
Other [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	3,387		4,554		6,462	8,105
Other [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	2,079		2,481		4,669	5,022
Other [Member] | Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	281		250		665	2,815
Other [Member] | Total Segments [Member]
Segment disclosure [Abstract]
Revenues	5,747		7,285		11,796	15,942
Other [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	$ (327)		$ (287)		$ (697)	$ (602)

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