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SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment disclosure [Abstract]
Revenues	$ 3,194,679	$ 2,136,672
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,121,510)	(1,276,928)
Operating costs	(251,597)	(207,040)
Equity in net earnings from investments	33,320	44,627
Depreciation and amortization	(157,120)	(132,353)
Impairment charges	0	(641,754)
Investments in unconsolidated affiliates	807,721	810,479	$ 805,032
Total assets	23,179,929	21,969,440	$ 23,078,754
Capital expenditures	176,734	949,679
Net income (loss)	386,176	(141,857)
Interest expense, net of capitalized interest	185,523	140,616
Income tax expense (benefit)	122,132	(55,395)
Noncash compensation expense	16,283	(1,302)
Other corporate costs and noncash items	(715)	(33,081)
Gain (loss) on extinguishment of debt		15,800
Impairment of equity investments	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	839,741	449,980
Cost of sales and fuel (exclusive of depreciation and operating costs)	(555,306)	(202,170)
Operating costs	(84,598)	(84,470)
Equity in net earnings from investments	1,728	806
Noncash compensation expense and other	3,151	(4,498)
Segment adjusted EBITDA	204,716	159,648
Depreciation and amortization	(67,032)	(58,756)
Impairment charges		(564,353)
Investments in unconsolidated affiliates	24,584	4,276
Total assets	6,535,260	6,374,552
Capital expenditures	39,651	181,610
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	2,610,065	1,770,592
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,060,319)	(1,278,754)
Operating costs	(124,369)	(89,571)
Equity in net earnings from investments	3,604	15,268
Noncash compensation expense and other	6,647	(6,619)
Segment adjusted EBITDA	435,628	410,916
Depreciation and amortization	(74,542)	(57,841)
Impairment charges		(77,401)
Investments in unconsolidated affiliates	420,614	435,024
Total assets	13,944,887	12,682,807
Capital expenditures	112,021	746,183
Natural Gas Liquids | Chisholm Pipeline Company [Member]
Segment disclosure [Abstract]
Impairment of equity investments		7,200
Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	248,814	120,783
Cost of sales and fuel (exclusive of depreciation and operating costs)	(10,013)	(1,539)
Operating costs	(42,317)	(33,307)
Equity in net earnings from investments	27,988	28,553
Noncash compensation expense and other	1,703	(1,966)
Segment adjusted EBITDA	226,175	112,524
Depreciation and amortization	(14,476)	(14,769)
Impairment charges		0
Investments in unconsolidated affiliates	362,523	371,179
Total assets	2,096,459	2,089,362
Capital expenditures	21,157	16,590
Total Segments [Member]
Segment disclosure [Abstract]
Revenues	3,698,620	2,341,355
Cost of sales and fuel (exclusive of depreciation and operating costs)	(2,625,638)	(1,482,463)
Operating costs	(251,284)	(207,348)
Equity in net earnings from investments	33,320	44,627
Noncash compensation expense and other	11,501	(13,083)
Segment adjusted EBITDA	866,519	683,088
Depreciation and amortization	(156,050)	(131,366)
Impairment charges		(641,754)
Investments in unconsolidated affiliates	807,721	810,479
Total assets	22,576,606	21,146,721
Capital expenditures	172,829	944,383
Other and Eliminations
Segment disclosure [Abstract]
Revenues	(503,941)	(204,683)
Cost of sales and fuel (exclusive of depreciation and operating costs)	504,128	205,535
Operating costs	(313)	308
Equity in net earnings from investments	0	0
Depreciation and amortization	(1,070)	(987)
Impairment charges		0
Investments in unconsolidated affiliates	0	0
Total assets	603,323	822,719
Capital expenditures	3,905	5,296
Natural Gas Gathering and Processing Intersegment [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	481,600	213,300
Natural Gas Liquids Regulated [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	570,600	435,100
Cost of sales and fuel (exclusive of depreciation and operating costs)	(135,800)	(120,400)
Natural Gas Pipelines Regulated [Member] | Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	181,400	73,900
Cost of sales and fuel (exclusive of depreciation and operating costs)	(12,800)	(6,100)
Operating Segments [Member] | Natural Gas Liquids Regulated [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	516,100	378,200
Noncustomer [Domain]
Segment disclosure [Abstract]
Revenues	(132,200)	80,200
NGL and Condensate Sales [Member]
Segment disclosure [Abstract]
Revenues	2,406,573	1,617,156
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	491,807	219,917
NGL and Condensate Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,414,830	1,596,711
NGL and Condensate Sales [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
NGL and Condensate Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,906,637	1,816,628
NGL and Condensate Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(500,064)	(199,472)
Residue Natural Gas Sales [Member]
Segment disclosure [Abstract]
Revenues	427,702	190,054
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	312,247	189,051
Residue Natural Gas Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Residue Natural Gas Sales [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	115,455	2,035
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	427,702	191,086
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	0	(1,032)
Gathering, Processing and Exchange Services Revenue
Segment disclosure [Abstract]
Revenues	144,918	158,473
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	31,687	37,937
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	113,231	120,536
Gathering, Processing and Exchange Services Revenue | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Gathering, Processing and Exchange Services Revenue | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	144,918	158,473
Gathering, Processing and Exchange Services Revenue | Other and Eliminations
Segment disclosure [Abstract]
Revenues	0	0
Transportation and Storage Revenue [Member]
Segment disclosure [Abstract]
Revenues	178,140	165,310
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
Transportation and Storage Revenue [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	48,728	50,755
Transportation and Storage Revenue [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	132,947	118,364
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	181,675	169,119
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(3,535)	(3,809)
Other [Member]
Segment disclosure [Abstract]
Revenues	37,346	5,679
Other [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	4,000	3,075
Other [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	33,276	2,590
Other [Member] | Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	412	384
Other [Member] | Total Segments [Member]
Segment disclosure [Abstract]
Revenues	37,688	6,049
Other [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	$ (342)	$ (370)

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