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SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment disclosure [Abstract]
Revenues	$ 2,457,575		$ 2,960,529		$ 5,237,533	$ 6,062,606
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,625,794)		(2,175,818)		(3,582,171)	(4,543,844)
Operating costs	(237,713)		(230,153)		(478,454)	(440,357)
Equity in net earnings (loss) from investments	34,118		36,570		77,599	76,757
Depreciation and amortization	(114,964)		(106,288)		(229,122)	(210,525)
Total assets	19,751,594		16,913,720		19,751,594	16,913,720	$ 18,231,671
Capital expenditures	830,459		350,885		1,720,164	615,352
Net income	311,963	$ 337,208	282,179	$ 266,049	649,171	548,228
Interest expense, net of capitalized interest	117,493		113,496		232,913	229,221
Income taxes	98,935		87,531		176,869	163,302
Noncash compensation expense	5,115		12,140		10,655	21,366
Other corporate costs and noncash items	(14,541)		2,659		(28,270)	(2,094)
Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	582,180		700,929		1,276,841	1,408,920
Cost of sales and fuel (exclusive of depreciation and operating costs)	(309,745)		(442,959)		(760,658)	(935,581)
Operating costs	(85,762)		(93,602)		(180,009)	(181,961)
Equity in net earnings (loss) from investments	(1,621)		(794)		(2,823)	874
Noncash compensation expense and other	1,571		3,292		5,516	5,165
Segment adjusted EBITDA	186,623		166,866		338,867	297,417
Depreciation and amortization	(53,552)		(48,149)		(106,233)	(95,897)
Total assets	6,343,968		5,585,519		6,343,968	5,585,519
Capital expenditures	213,222		108,842		428,370	220,571
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member]
Segment disclosure [Abstract]
Revenues	317,900		448,500		653,700	846,300
Natural Gas Liquids [Member]
Segment disclosure [Abstract]
Revenues	2,072,558		2,613,930		4,384,058	5,306,399
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,629,573)		(2,183,512)		(3,476,246)	(4,464,584)
Operating costs	(114,933)		(99,610)		(225,371)	(188,202)
Equity in net earnings (loss) from investments	15,972		16,582		33,516	33,006
Noncash compensation expense and other	2,738		4,671		8,444	7,521
Segment adjusted EBITDA	346,762		352,061		724,401	694,140
Depreciation and amortization	(46,346)		(42,878)		(92,747)	(85,305)
Total assets	10,694,485		8,898,255		10,694,485	8,898,255
Capital expenditures	591,762		216,934		1,231,100	341,855
Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	303,400		294,300		626,500	594,300
Cost of sales and fuel (exclusive of depreciation and operating costs)	(116,900)		(124,000)		(235,400)	(246,800)
Natural Gas Pipelines [Member]
Segment disclosure [Abstract]
Revenues	117,531		99,792		233,931	209,703
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,649)		(2,637)		(3,404)	(8,091)
Operating costs	(36,605)		(34,959)		(72,873)	(68,149)
Equity in net earnings (loss) from investments	19,767		20,782		46,906	42,877
Noncash compensation expense and other	1,500		2,388		2,632	2,651
Segment adjusted EBITDA	100,544		85,366		207,192	178,991
Depreciation and amortization	(14,167)		(14,426)		(28,323)	(27,695)
Total assets	2,083,940		2,073,043		2,083,940	2,073,043
Capital expenditures	21,406		20,477		50,094	40,375
Natural Gas Pipelines [Member] | Natural Gas Pipelines Regulated [Member]
Segment disclosure [Abstract]
Revenues	72,300		64,500		142,400	132,500
Cost of sales and fuel (exclusive of depreciation and operating costs)	(3,700)		(5,800)		(9,300)	(14,900)
Total Segments [Member]
Segment disclosure [Abstract]
Revenues	2,772,269		3,414,651		5,894,830	6,925,022
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,940,967)		(2,629,108)		(4,240,308)	(5,408,256)
Operating costs	(237,300)		(228,171)		(478,253)	(438,312)
Equity in net earnings (loss) from investments	34,118		36,570		77,599	76,757
Noncash compensation expense and other	5,809		10,351		16,592	15,337
Segment adjusted EBITDA	633,929		604,293		1,270,460	1,170,548
Depreciation and amortization	(114,065)		(105,453)		(227,303)	(208,897)
Total assets	19,122,393		16,556,817		19,122,393	16,556,817
Capital expenditures	826,390		346,253		1,709,564	602,801
Other and Eliminations
Segment disclosure [Abstract]
Revenues	(314,694)		(454,122)		(657,297)	(862,416)
Cost of sales and fuel (exclusive of depreciation and operating costs)	315,173		453,290		658,137	864,412
Operating costs	(413)		(1,982)		(201)	(2,045)
Equity in net earnings (loss) from investments	0		0		0	0
Depreciation and amortization	(899)		(835)		(1,819)	(1,628)
Total assets	629,201		356,903		629,201	356,903
Capital expenditures	4,069		4,632		10,600	12,551
Operating Segments [Member] | Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	267,300		255,000		537,300	508,400
Noncustomer [Domain]
Segment disclosure [Abstract]
Revenues	18,600		(5,400)		40,900	(14,400)
NGL and Condensate Sales [Member]
Segment disclosure [Abstract]
Revenues	1,923,794		2,468,800		4,075,878	5,025,817
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	312,757		447,839		645,089	860,996
NGL and Condensate Sales [Member] | Natural Gas Liquids [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,921,564		2,469,517		4,079,667	5,022,287
NGL and Condensate Sales [Member] | Natural Gas Pipelines [Member]
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	2,234,321		2,917,356		4,724,756	5,883,283
NGL and Condensate Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(310,527)		(448,556)		(648,878)	(857,466)
Residue Natural Gas Sales [Member]
Segment disclosure [Abstract]
Revenues	221,374		205,769		541,380	467,935
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	221,333		208,618		540,369	463,615
Residue Natural Gas Sales [Member] | Natural Gas Liquids [Member]
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 [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	41		179		1,011	5,098
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	221,374		208,797		541,380	468,713
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	0		(3,028)		0	(778)
Gathering, Processing and Exchange Services Revenue
Segment disclosure [Abstract]
Revenues	149,394		139,271		287,670	260,937
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	43,536		42,801		83,278	81,230
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	105,858		96,470		204,392	179,728
Gathering, Processing and Exchange Services Revenue | Natural Gas Pipelines [Member]
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	149,394		139,271		287,670	260,958
Gathering, Processing and Exchange Services Revenue | Other and Eliminations
Segment disclosure [Abstract]
Revenues	0		0		0	(21)
Transportation and Storage Revenue [Member]
Segment disclosure [Abstract]
Revenues	145,893		135,794		299,164	285,516
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 [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	42,655		45,012		94,977	98,490
Transportation and Storage Revenue [Member] | Natural Gas Pipelines [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	105,701		93,277		209,171	191,615
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	148,356		138,289		304,148	290,105
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(2,463)		(2,495)		(4,984)	(4,589)
Other [Member]
Segment disclosure [Abstract]
Revenues	17,120		10,895		33,441	22,401
Other [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	4,554		1,671		8,105	3,079
Other [Member] | Natural Gas Liquids [Member]
Segment disclosure [Abstract]
Revenues	2,481		2,931		5,022	5,894
Other [Member] | Natural Gas Pipelines [Member]
Segment disclosure [Abstract]
Revenues	11,789		6,336		23,749	12,990
Other [Member] | Total Segments [Member]
Segment disclosure [Abstract]
Revenues	18,824		10,938		36,876	21,963
Other [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	$ (1,704)		$ (43)		$ (3,435)	$ 438

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