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SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment disclosure [Abstract]
Revenues	$ 3,388,964		$ 1,660,729		$ 6,583,643	$ 3,797,401
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,366,979)		(940,458)		(4,488,489)	(2,217,386)
Operating costs	(254,259)		(224,464)		(505,856)	(431,504)
Equity in net earnings from investments	25,720		25,328		59,040	69,955
Depreciation and amortization	(156,921)		(140,416)		(314,041)	(272,769)
Impairment charges	0		0		0	(641,754)
Investments in unconsolidated affiliates	800,351		790,035		800,351	790,035	$ 805,032
Total assets	23,437,248		22,992,467		23,437,248	22,992,467	$ 23,078,754
Capital expenditures	147,388		594,282		324,122	1,543,961
Net income (loss)	342,139	$ 386,176	134,321	$ (141,857)	728,315	(7,536)
Interest expense, net of capitalized interest	184,957		218,968		370,480	359,584
Income tax expense (benefit)	110,069		43,140		232,201	(12,255)
Noncash compensation expense	7,825		957		24,108	(345)
Other corporate costs and noncash items	2,342		(1,578)		1,627	(34,659)
Gain (loss) on extinguishment of debt			4,300			20,000
Impairment of equity investments	0		0		0	37,730
Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Impairment of long-lived assets						380,500
Goodwill impairment charge						153,400
Natural Gas Liquids
Segment disclosure [Abstract]
Impairment of long-lived assets						70,200
Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	863,452		299,809		1,703,193	749,789
Cost of sales and fuel (exclusive of depreciation and operating costs)	(550,486)		(132,221)		(1,105,792)	(334,391)
Operating costs	(86,429)		(78,668)		(171,027)	(163,138)
Equity in net earnings from investments	442		(2,149)		2,170	(1,343)
Noncash compensation expense and other	2,287		1,978		5,438	(2,520)
Segment adjusted EBITDA	229,266		88,749		433,982	248,397
Depreciation and amortization	(67,268)		(55,419)		(134,300)	(114,175)
Impairment charges						(564,353)
Investments in unconsolidated affiliates	23,529		2,250		23,529	2,250
Total assets	6,564,118		6,426,121		6,564,118	6,426,121
Capital expenditures	56,872		118,171		96,523	299,781
Natural Gas Gathering And Processing [Member] | Venice Energy Services Company [Member]
Segment disclosure [Abstract]
Impairment of equity investments						30,500
Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	2,999,478		1,335,714		5,609,543	3,106,306
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,399,919)		(905,154)		(4,460,238)	(2,183,908)
Operating costs	(128,834)		(106,977)		(253,203)	(196,548)
Equity in net earnings from investments	5,090		7,797		8,694	23,065
Noncash compensation expense and other	4,476		6,262		11,123	(357)
Segment adjusted EBITDA	480,291		337,642		915,919	748,558
Depreciation and amortization	(74,151)		(69,065)		(148,693)	(126,906)
Impairment charges						(77,401)
Investments in unconsolidated affiliates	420,949		427,032		420,949	427,032
Total assets	14,309,709		13,183,168		14,309,709	13,183,168
Capital expenditures	59,967		459,807		171,988	1,205,990
Natural Gas Liquids | Chisholm Pipeline Company [Member]
Segment disclosure [Abstract]
Impairment of equity investments						7,200
Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	112,444		122,058		361,258	242,841
Cost of sales and fuel (exclusive of depreciation and operating costs)	(544)		(168)		(10,557)	(1,707)
Operating costs	(38,506)		(33,092)		(80,823)	(66,399)
Equity in net earnings from investments	20,188		19,680		48,176	48,233
Noncash compensation expense and other	1,114		1,355		2,817	(611)
Segment adjusted EBITDA	94,696		109,833		320,871	222,357
Depreciation and amortization	(14,489)		(14,925)		(28,965)	(29,694)
Impairment charges						0
Investments in unconsolidated affiliates	355,873		360,753		355,873	360,753
Total assets	2,110,459		2,064,197		2,110,459	2,064,197
Capital expenditures	27,796		10,910		48,953	27,500
Total Segments [Member]
Segment disclosure [Abstract]
Revenues	3,975,374		1,757,581		7,673,994	4,098,936
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,950,949)		(1,037,543)		(5,576,587)	(2,520,006)
Operating costs	(253,769)		(218,737)		(505,053)	(426,085)
Equity in net earnings from investments	25,720		25,328		59,040	69,955
Noncash compensation expense and other	7,877		9,595		19,378	(3,488)
Segment adjusted EBITDA	804,253		536,224		1,670,772	1,219,312
Depreciation and amortization	(155,908)		(139,409)		(311,958)	(270,775)
Impairment charges						(641,754)
Investments in unconsolidated affiliates	800,351		790,035		800,351	790,035
Total assets	22,984,286		21,673,486		22,984,286	21,673,486
Capital expenditures	144,635		588,888		317,464	1,533,271
Other and Eliminations
Segment disclosure [Abstract]
Revenues	(586,410)		(96,852)		(1,090,351)	(301,535)
Cost of sales and fuel (exclusive of depreciation and operating costs)	583,970		97,085		1,088,098	302,620
Operating costs	(490)		(5,727)		(803)	(5,419)
Equity in net earnings from investments	0		0		0	0
Depreciation and amortization	(1,013)		(1,007)		(2,083)	(1,994)
Impairment charges						0
Investments in unconsolidated affiliates	0		0		0	0
Total assets	452,962		1,318,981		452,962	1,318,981
Capital expenditures	2,753		5,394		6,658	10,690
Natural Gas Gathering and Processing Intersegment [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	555,600		108,200		1,000,000	321,500
Natural Gas Liquids Regulated [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	603,100		477,200		1,200,000	912,300
Cost of sales and fuel (exclusive of depreciation and operating costs)	(153,300)		(117,100)		(289,100)	(237,500)
Natural Gas Liquids Regulated [Member] | Natural Gas Liquids | Operating Segments [Member]
Segment disclosure [Abstract]
Revenues	557,200		432,600		1,100,000	810,800
Natural Gas Pipelines Regulated [Member] | Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	69,400		79,900		250,800	153,800
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,800)		(6,700)		(16,600)	(12,800)
Noncustomer [Domain]
Segment disclosure [Abstract]
Revenues	(76,000)		18,800		(208,200)	99,000
NGL and Condensate Sales [Member]
Segment disclosure [Abstract]
Revenues	2,813,847		1,195,194		5,220,420	2,812,350
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	566,383		109,581		1,058,190	329,498
NGL and Condensate Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,829,604		1,174,580		5,244,434	2,771,291
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	3,395,987		1,284,161		6,302,624	3,100,789
NGL and Condensate Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(582,140)		(88,967)		(1,082,204)	(288,439)
Residue Natural Gas Sales [Member]
Segment disclosure [Abstract]
Revenues	257,806		146,961		685,508	337,015
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	257,802		150,892		570,049	339,943
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	4		0		115,459	2,035
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	257,806		150,892		685,508	341,978
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	0		(3,931)		0	(4,963)
Gathering, Processing and Exchange Services Revenue
Segment disclosure [Abstract]
Revenues	163,763		154,123		308,681	312,596
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	34,139		35,949		65,826	73,886
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	129,624		118,174		242,855	238,710
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	163,763		154,123		308,681	312,596
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	146,695		159,031		324,835	324,341
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	37,864		40,881		86,592	91,636
Transportation and Storage Revenue [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	112,337		121,777		245,284	240,141
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	150,201		162,658		331,876	331,777
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(3,506)		(3,627)		(7,041)	(7,436)
Other [Member]
Segment disclosure [Abstract]
Revenues	6,853		5,420		44,199	11,099
Other [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	5,128		3,387		9,128	6,462
Other [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	2,386		2,079		35,662	4,669
Other [Member] | Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	103		281		515	665
Other [Member] | Total Segments [Member]
Segment disclosure [Abstract]
Revenues	7,617		5,747		45,305	11,796
Other [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	$ (764)		$ (327)		$ (1,106)	$ (697)

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