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SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment disclosure [Abstract]
Revenues	$ 2,136,672	$ 2,779,958
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,276,928)	(1,956,377)
Operating costs	(207,040)	(240,741)
Equity in net earnings (loss) from investments	44,627	43,481
Depreciation and amortization	(132,353)	(114,158)
Impairment charges	(641,754)	0
Investments in unconsolidated affiliates	810,479	950,924	$ 861,844
Total assets	21,969,440	18,934,325	$ 21,812,121
Capital expenditures	949,679	889,705
Net income (loss)	(141,857)	337,208
Interest expense, net of capitalized interest	140,616	115,420
Income tax expense (benefit)	(55,395)	77,934
Noncash compensation expense	(1,302)	5,540
Other corporate costs and noncash items	(33,081)	(13,729)
Gain (loss) on extinguishment of debt	15,800
Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	449,980	694,661
Cost of sales and fuel (exclusive of depreciation and operating costs)	(202,170)	(450,913)
Operating costs	(84,470)	(94,247)
Equity in net earnings (loss) from investments	806	(1,202)
Noncash compensation expense and other	(4,498)	3,945
Segment adjusted EBITDA	159,648	152,244
Depreciation and amortization	(58,756)	(52,681)
Impairment charges	(564,353)
Investments in unconsolidated affiliates	4,276	39,749
Total assets	6,374,552	6,208,883
Capital expenditures	181,610	215,148
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member]
Segment disclosure [Abstract]
Revenues	213,300	335,800
Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	1,770,592	2,311,500
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,278,754)	(1,846,673)
Operating costs	(89,571)	(110,438)
Equity in net earnings (loss) from investments	15,268	17,544
Noncash compensation expense and other	(6,619)	5,706
Segment adjusted EBITDA	410,916	377,639
Depreciation and amortization	(57,841)	(46,401)
Impairment charges	(77,401)
Investments in unconsolidated affiliates	435,024	447,272
Total assets	12,682,807	10,220,412
Capital expenditures	746,183	639,338
Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	435,100	323,100
Cost of sales and fuel (exclusive of depreciation and operating costs)	(120,400)	(118,500)
Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	120,783	116,400
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,539)	(1,755)
Operating costs	(33,307)	(36,268)
Equity in net earnings (loss) from investments	28,553	27,139
Noncash compensation expense and other	(1,966)	1,132
Segment adjusted EBITDA	112,524	106,648
Depreciation and amortization	(14,769)	(14,156)
Impairment charges	0
Investments in unconsolidated affiliates	371,179	463,903
Total assets	2,089,362	2,138,759
Capital expenditures	16,590	28,688
Natural Gas Pipelines | Natural Gas Pipelines Regulated [Member]
Segment disclosure [Abstract]
Revenues	73,900	70,100
Cost of sales and fuel (exclusive of depreciation and operating costs)	(6,100)	(5,600)
Total Segments [Member]
Segment disclosure [Abstract]
Revenues	2,341,355	3,122,561
Cost of sales and fuel (exclusive of depreciation and operating costs)	(1,482,463)	(2,299,341)
Operating costs	(207,348)	(240,953)
Equity in net earnings (loss) from investments	44,627	43,481
Noncash compensation expense and other	(13,083)	10,783
Segment adjusted EBITDA	683,088	636,531
Depreciation and amortization	(131,366)	(113,238)
Impairment charges	(641,754)
Investments in unconsolidated affiliates	810,479	950,924
Total assets	21,146,721	18,568,054
Capital expenditures	944,383	883,174
Other and Eliminations
Segment disclosure [Abstract]
Revenues	(204,683)	(342,603)
Cost of sales and fuel (exclusive of depreciation and operating costs)	205,535	342,964
Operating costs	308	212
Equity in net earnings (loss) from investments	0	0
Depreciation and amortization	(987)	(920)
Impairment charges	0
Investments in unconsolidated affiliates	0	0
Total assets	822,719	366,271
Capital expenditures	5,296	6,531
Operating Segments [Member] | Natural Gas Liquids | Natural Gas Liquids Regulated [Member]
Segment disclosure [Abstract]
Revenues	378,200	270,000
Noncustomer [Domain]
Segment disclosure [Abstract]
Revenues	80,200	22,300
NGL and Condensate Sales [Member]
Segment disclosure [Abstract]
Revenues	1,617,156	2,152,084
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	219,917	332,332
NGL and Condensate Sales [Member] | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,596,711	2,158,103
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	1,816,628	2,490,435
NGL and Condensate Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(199,472)	(338,351)
Residue Natural Gas Sales [Member]
Segment disclosure [Abstract]
Revenues	190,054	320,006
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	189,051	319,036
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	2,035	970
Residue Natural Gas Sales [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	191,086	320,006
Residue Natural Gas Sales [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(1,032)	0
Gathering, Processing and Exchange Services Revenue
Segment disclosure [Abstract]
Revenues	158,473	138,276
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	37,937	39,742
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	120,536	98,534
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	158,473	138,276
Gathering, Processing and Exchange Services Revenue | Other and Eliminations
Segment disclosure [Abstract]
Revenues	0	0
Transportation and Storage Revenue [Member]
Segment disclosure [Abstract]
Revenues	165,310	161,250
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	50,755	52,322
Transportation and Storage Revenue [Member] | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	118,364	112,865
Transportation and Storage Revenue [Member] | Total Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	169,119	165,187
Transportation and Storage Revenue [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	(3,809)	(3,937)
Other [Member]
Segment disclosure [Abstract]
Revenues	5,679	8,342
Other [Member] | Natural Gas Gathering And Processing [Member]
Segment disclosure [Abstract]
Revenues	3,075	3,551
Other [Member] | Natural Gas Liquids
Segment disclosure [Abstract]
Revenues	2,590	2,541
Other [Member] | Natural Gas Pipelines
Segment disclosure [Abstract]
Revenues	384	2,565
Other [Member] | Total Segments [Member]
Segment disclosure [Abstract]
Revenues	6,049	8,657
Other [Member] | Other and Eliminations
Segment disclosure [Abstract]
Revenues	$ (370)	$ (315)

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