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SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment disclosure [Abstract]
Revenues	$ 2,263,228			$ 3,393,890			$ 7,500,761	$ 9,456,496
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,414,528)			(2,560,765)			(4,996,699)	(7,104,609)
Operating costs	(245,135)			(230,371)			(723,589)	(670,728)
Equity in net earnings (loss) from investments	37,576			39,313			115,175	116,070
Depreciation and amortization	(121,430)			(107,383)			(350,552)	(317,908)
Total assets	21,335,907			17,911,314			21,335,907	17,911,314	$ 18,231,671
Capital expenditures	1,019,174			694,303			2,739,338	1,309,655
Net income	309,155	$ 311,963	$ 337,208	313,916	$ 282,179	$ 266,049	958,326	862,144
Interest Expense	129,577			121,910			362,490	351,131
Income taxes	97,365			102,983			274,234	266,285
Noncash compensation expense	9,757			5,829			20,412	27,195
Other corporate costs and noncash items	(20,711)			(3,290)			(48,981)	(5,384)
Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	476,212			791,255			1,753,053	2,200,175
Cost of sales and fuel (exclusive of depreciation and operating costs)	(210,739)			(542,463)			(971,397)	(1,478,044)
Operating costs	(91,227)			(90,970)			(271,236)	(272,931)
Equity in net earnings (loss) from investments	(1,837)			74			(4,660)	948
Noncash compensation expense and other	2,883			1,703			8,399	6,868
Segment adjusted EBITDA	175,292			159,599			514,159	457,016
Depreciation and amortization	(55,781)			(49,223)			(162,014)	(145,120)
Total assets	6,546,417			5,811,140			6,546,417	5,811,140
Capital expenditures	245,745			213,034			674,115	433,605
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member]
Segment disclosure [Abstract]
Revenues	244,200			519,700			897,900	1,400,000
Natural Gas Liquids [Member]
Segment disclosure [Abstract]
Revenues	1,900,507			3,026,288			6,284,565	8,332,687
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,438,206)			(2,544,854)			(4,914,452)	(7,009,438)
Operating costs	(114,903)			(101,126)			(340,274)	(289,328)
Equity in net earnings (loss) from investments	15,890			16,450			49,406	49,456
Noncash compensation expense and other	4,174			2,268			12,618	9,789
Segment adjusted EBITDA	367,462			399,026			1,091,863	1,093,166
Depreciation and amortization	(50,419)			(43,688)			(143,166)	(128,993)
Total assets	11,662,489			9,632,212			11,662,489	9,632,212
Capital expenditures	738,038			444,780			1,969,138	786,635
Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	379,700			316,000			1,000,000	910,300
Cost of sales and fuel (exclusive of depreciation and operating costs)	(129,500)			(132,700)			(364,900)	(379,500)
Natural Gas Pipelines [Member]
Segment disclosure [Abstract]
Revenues	121,548			105,194			355,479	314,897
Cost of sales and fuel (exclusive of depreciation and operating costs)	(381)			(2,384)			(3,785)	(10,475)
Operating costs	(40,170)			(36,543)			(113,043)	(104,692)
Equity in net earnings (loss) from investments	23,523			22,789			70,429	65,666
Noncash compensation expense and other	(701)			1,050			1,931	3,701
Segment adjusted EBITDA	103,819			90,106			311,011	269,097
Depreciation and amortization	(14,330)			(13,625)			(42,653)	(41,320)
Total assets	2,083,773			2,109,897			2,083,773	2,109,897
Capital expenditures	27,767			31,522			77,861	71,897
Natural Gas Pipelines [Member] | Natural Gas Pipelines Regulated [Member]
Segment disclosure [Abstract]
Revenues	72,300			65,900			214,700	198,400
Cost of sales and fuel (exclusive of depreciation and operating costs)	(5,100)			(5,500)			(14,400)	(20,400)
Total Segments [Member]
Segment disclosure [Abstract]
Revenues	2,498,267			3,922,737			8,393,097	10,847,759
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,649,326)			(3,089,701)			(5,889,634)	(8,497,957)
Operating costs	(246,300)			(228,639)			(724,553)	(666,951)
Equity in net earnings (loss) from investments	37,576			39,313			115,175	116,070
Noncash compensation expense and other	6,356			5,021			22,948	20,358
Segment adjusted EBITDA	646,573			648,731			1,917,033	1,819,279
Depreciation and amortization	(120,530)			(106,536)			(347,833)	(315,433)
Total assets	20,292,679			17,553,249			20,292,679	17,553,249
Capital expenditures	1,011,550			689,336			2,721,114	1,292,137
Other and Eliminations
Segment disclosure [Abstract]
Revenues	(235,039)			(528,847)			(892,336)	(1,391,263)
Cost of sales and fuel (exclusive of depreciation and operating costs)	234,798			528,936			892,935	1,393,348
Operating costs	1,165			(1,732)			964	(3,777)
Equity in net earnings (loss) from investments	0			0			0	0
Depreciation and amortization	(900)			(847)			(2,719)	(2,475)
Total assets	1,043,228			358,065			1,043,228	358,065
Capital expenditures	7,624			4,967			18,224	17,518
Operating Segments [Member] | Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	315,700			276,400			853,000	784,800
Noncustomer [Domain]
Segment disclosure [Abstract]
Revenues	89,000			(17,700)			129,900	(32,100)
NGL and Condensate Sales [Member]
Segment disclosure [Abstract]
Revenues	1,761,482			2,836,661			5,837,360	7,862,478
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	244,932			501,163			890,021	1,362,159
NGL and Condensate Sales [Member] | Natural Gas Liquids [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,746,630			2,861,896			5,826,297	7,884,183
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	1,991,562			3,363,059			6,716,318	9,246,342
NGL and Condensate Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(230,080)			(526,398)			(878,958)	(1,383,864)
Residue Natural Gas Sales [Member]
Segment disclosure [Abstract]
Revenues	184,967			246,237			726,347	714,172
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	185,303			245,474			725,672	709,089
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	231			763			1,242	5,861
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	185,534			246,237			726,914	714,950
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(567)			0			(567)	(778)
Gathering, Processing and Exchange Services Revenue
Segment disclosure [Abstract]
Revenues	147,974			157,934			435,644	418,871
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	42,795			41,101			126,073	122,331
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	105,179			116,833			309,571	296,561
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	147,974			157,934			435,644	418,892
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	152,197			140,912			451,361	426,428
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	46,407			45,251			141,384	143,741
Transportation and Storage Revenue [Member] | Natural Gas Pipelines [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	108,384			98,031			317,555	289,646
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	154,791			143,282			458,939	433,387
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(2,594)			(2,370)			(7,578)	(6,959)
Other [Member]
Segment disclosure [Abstract]
Revenues	16,608			12,146			50,049	34,547
Other [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	3,182			3,517			11,287	6,596
Other [Member] | Natural Gas Liquids [Member]
Segment disclosure [Abstract]
Revenues	2,291			2,308			7,313	8,202
Other [Member] | Natural Gas Pipelines [Member]
Segment disclosure [Abstract]
Revenues	12,933			6,400			36,682	19,390
Other [Member] | Total Segments [Member]
Segment disclosure [Abstract]
Revenues	18,406			12,225			55,282	34,188
Other [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	$ (1,798)			$ (79)			$ (5,233)	$ 359

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