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SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment disclosure [Abstract]
Revenues	$ 2,174,264			$ 2,263,228			$ 5,971,665	$ 7,500,761
Cost of sales and fuel (exclusive of items shown separately below)	(1,265,674)			(1,414,528)			(3,483,060)	(4,996,699)
Operating costs	(204,929)			(245,135)			(636,433)	(723,589)
Equity in net earnings (loss) from investments	38,046			37,576			108,001	115,175
Depreciation and amortization	(153,245)			(121,430)			(426,014)	(350,552)
Impairment charges	0			0			(641,754)	0
Total assets	22,780,876			21,335,907			22,780,876	21,335,907	$ 21,812,121
Capital expenditures	380,042			1,019,174			1,924,003	2,739,338
Equity Method Investments	790,373			870,511			790,373	870,511	$ 861,844
Net income	312,316	$ 134,321	$ (141,857)	309,155	$ 311,963	$ 337,208	304,780	958,326
Interest expense, net of capitalized interest	176,371			129,577			535,955	362,490
Income tax expense (benefit)	106,555			97,365			94,300	274,234
Noncash compensation expense	1,606			9,757			1,261	20,412
Other corporate costs and noncash items	(5,865)			(20,711)			(40,524)	(48,981)
Gain (loss) on extinguishment of debt	2,200						22,200
Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	459,405			476,212			1,209,194	1,753,053
Cost of sales and fuel (exclusive of items shown separately below)	(207,519)			(210,739)			(541,910)	(971,397)
Operating costs	(69,351)			(91,227)			(232,489)	(271,236)
Equity in net earnings (loss) from investments	(42)			(1,837)			(1,385)	(4,660)
Noncash compensation expense and other	655			2,883			(1,865)	8,399
Segment adjusted EBITDA	183,148			175,292			431,545	514,159
Depreciation and amortization	(66,459)			(55,781)			(180,634)	(162,014)
Impairment charges							(564,353)
Total assets	6,437,301			6,546,417			6,437,301	6,546,417
Capital expenditures	63,030			245,745			362,811	674,115
Equity Method Investments	2,276			35,252			2,276	35,252
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member]
Segment disclosure [Abstract]
Revenues	235,600			244,200			557,100	897,900
Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	1,832,217			1,900,507			4,938,523	6,284,565
Cost of sales and fuel (exclusive of items shown separately below)	(1,289,667)			(1,438,206)			(3,473,575)	(4,914,452)
Operating costs	(101,223)			(114,903)			(297,771)	(340,274)
Equity in net earnings (loss) from investments	8,018			15,890			31,083	49,406
Noncash compensation expense and other	1,898			4,174			1,541	12,618
Segment adjusted EBITDA	451,243			367,462			1,199,801	1,091,863
Depreciation and amortization	(71,534)			(50,419)			(198,440)	(143,166)
Impairment charges							(77,401)
Total assets	13,449,529			11,662,489			13,449,529	11,662,489
Capital expenditures	298,891			738,038			1,504,881	1,969,138
Equity Method Investments	426,621			445,755			426,621	445,755
Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	541,700			379,700			1,454,000	1,000,000
Cost of sales and fuel (exclusive of items shown separately below)	(137,500)			(129,500)			(375,000)	(364,900)
Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	117,296			121,548			360,137	355,479
Cost of sales and fuel (exclusive of items shown separately below)	(3,389)			(381)			(5,096)	(3,785)
Operating costs	(34,567)			(40,170)			(100,966)	(113,043)
Equity in net earnings (loss) from investments	30,070			23,523			78,303	70,429
Noncash compensation expense and other	427			(701)			(184)	1,931
Segment adjusted EBITDA	109,837			103,819			332,194	311,011
Depreciation and amortization	(14,243)			(14,330)			(43,937)	(42,653)
Impairment charges							0
Total assets	2,082,846			2,083,773			2,082,846	2,083,773
Capital expenditures	12,978			27,767			40,478	77,861
Equity Method Investments	361,476			389,504			361,476	389,504
Natural Gas Pipelines | Natural Gas Pipelines Regulated [Member]
Segment disclosure [Abstract]
Revenues	71,800			72,300			225,600	214,700
Cost of sales and fuel (exclusive of items shown separately below)	(9,600)			(5,100)			(22,400)	(14,400)
Total Segments [Member]
Segment disclosure [Abstract]
Revenues	2,408,918			2,498,267			6,507,854	8,393,097
Cost of sales and fuel (exclusive of items shown separately below)	(1,500,575)			(1,649,326)			(4,020,581)	(5,889,634)
Operating costs	(205,141)			(246,300)			(631,226)	(724,553)
Equity in net earnings (loss) from investments	38,046			37,576			108,001	115,175
Noncash compensation expense and other	2,980			6,356			(508)	22,948
Segment adjusted EBITDA	744,228			646,573			1,963,540	1,917,033
Depreciation and amortization	(152,236)			(120,530)			(423,011)	(347,833)
Impairment charges							(641,754)
Total assets	21,969,676			20,292,679			21,969,676	20,292,679
Capital expenditures	374,899			1,011,550			1,908,170	2,721,114
Equity Method Investments	790,373			870,511			790,373	870,511
Other and Eliminations
Segment disclosure [Abstract]
Revenues	(234,654)			(235,039)			(536,189)	(892,336)
Cost of sales and fuel (exclusive of items shown separately below)	234,901			234,798			537,521	892,935
Operating costs	212			1,165			(5,207)	964
Equity in net earnings (loss) from investments	0			0			0	0
Depreciation and amortization	(1,009)			(900)			(3,003)	(2,719)
Impairment charges							0
Total assets	811,200			1,043,228			811,200	1,043,228
Capital expenditures	5,143			7,624			15,833	18,224
Equity Method Investments	0			0			0	0
Operating Segments [Member] | Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	495,400			315,700			1,306,200	853,000
Noncustomer [Domain]
Segment disclosure [Abstract]
Revenues	4,000			89,000			103,000	129,900
NGL and Condensate Sales [Member]
Segment disclosure [Abstract]
Revenues	1,673,202			1,761,482			4,485,552	5,837,360
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	239,810			244,932			569,308	890,021
NGL and Condensate Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,658,123			1,746,630			4,429,414	5,826,297
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	1,897,933			1,991,562			4,998,722	6,716,318
NGL and Condensate Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(224,731)			(230,080)			(513,170)	(878,958)
Residue Natural Gas Sales [Member]
Segment disclosure [Abstract]
Revenues	176,593			184,967			513,608	726,347
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	178,492			185,303			518,435	725,672
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	3,998			231			6,033	1,242
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	182,490			185,534			524,468	726,914
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(5,897)			(567)			(10,860)	(567)
Gathering, Processing and Exchange Services Revenue
Segment disclosure [Abstract]
Revenues	168,669			147,974			481,265	435,644
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	36,459			42,795			110,345	126,073
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	132,210			105,179			370,920	309,571
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	168,669			147,974			481,265	435,644
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	149,224			162,321			473,565	479,586
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	39,774			46,407			131,410	141,384
Transportation and Storage Revenue [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	113,047			119,924			353,188	350,029
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	152,821			166,331			484,598	491,413
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(3,597)			(4,010)			(11,033)	(11,827)
Other [Member]
Segment disclosure [Abstract]
Revenues	6,576			6,484			17,675	21,824
Other [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	4,644			3,182			11,106	11,287
Other [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	2,110			2,291			6,779	7,313
Other [Member] | Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	251			1,393			916	4,208
Other [Member] | Total Segments [Member]
Segment disclosure [Abstract]
Revenues	7,005			6,866			18,801	22,808
Other [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	$ (429)			$ (382)			$ (1,126)	$ (984)

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