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SEGMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment disclosure [Abstract]      
Revenues $ 5,444,609 $ 3,194,679  
Cost of sales and fuel (exclusive of depreciation and operating costs) (4,365,948) (2,121,510)  
Operating costs (263,917) (251,597)  
Equity in net earnings from investments 36,340 33,320  
Depreciation and amortization (153,858) (157,120)  
Investments in unconsolidated affiliates 797,391 807,721 $ 797,613
Total assets 23,992,705 23,179,929 $ 23,621,613
Capital expenditures 256,978 176,734  
Net income 391,171 386,176  
Interest expense, net of capitalized interest 172,054 185,523  
Income tax expense 122,420 122,132  
Noncash compensation expense 24,733 16,283  
Other corporate costs and noncash items 1,595 (715)  
Other and eliminations      
Segment disclosure [Abstract]      
Revenues (1,030,633) (503,941)  
Cost of sales and fuel (exclusive of depreciation and operating costs) 1,028,719 504,128  
Operating costs (136) (313)  
Equity in net earnings from investments 0 0  
Depreciation and amortization (1,057) (1,070)  
Investments in unconsolidated affiliates 0 0  
Total assets (177,097) 603,323  
Capital expenditures 14,790 3,905  
Natural Gas Gathering And Processing [Member]      
Segment disclosure [Abstract]      
Revenues 1,591,670 839,741  
Cost of sales and fuel (exclusive of depreciation and operating costs) (1,288,551) (555,306)  
Operating costs (93,711) (84,598)  
Equity in net earnings from investments 1,633 1,728  
Noncash compensation expense and other 3,655 3,151  
Segment adjusted EBITDA 214,696 204,716  
Depreciation and amortization (62,726) (67,032)  
Investments in unconsolidated affiliates 27,350 24,584  
Total assets 6,914,107 6,535,260  
Capital expenditures 93,298 39,651  
Natural Gas Liquids      
Segment disclosure [Abstract]      
Revenues 4,734,235 2,610,065  
Cost of sales and fuel (exclusive of depreciation and operating costs) (4,089,124) (2,060,319)  
Operating costs (128,862) (124,369)  
Equity in net earnings from investments 5,441 3,604  
Noncash compensation expense and other 5,924 6,647  
Segment adjusted EBITDA 527,614 435,628  
Depreciation and amortization (75,030) (74,542)  
Investments in unconsolidated affiliates 414,966 420,614  
Total assets 15,101,665 13,944,887  
Capital expenditures 125,535 112,021  
Natural Gas Pipelines      
Segment disclosure [Abstract]      
Revenues 149,337 248,814  
Cost of sales and fuel (exclusive of depreciation and operating costs) (16,992) (10,013)  
Operating costs (41,208) (42,317)  
Equity in net earnings from investments 29,266 27,988  
Noncash compensation expense and other 3,118 1,703  
Segment adjusted EBITDA 123,521 226,175  
Depreciation and amortization (15,045) (14,476)  
Investments in unconsolidated affiliates 355,075 362,523  
Total assets 2,154,030 2,096,459  
Capital expenditures 23,355 21,157  
Total Segments [Member]      
Segment disclosure [Abstract]      
Revenues 6,475,242 3,698,620  
Cost of sales and fuel (exclusive of depreciation and operating costs) (5,394,667) (2,625,638)  
Operating costs (263,781) (251,284)  
Equity in net earnings from investments 36,340 33,320  
Noncash compensation expense and other 12,697 11,501  
Segment adjusted EBITDA 865,831 866,519  
Depreciation and amortization (152,801) (156,050)  
Investments in unconsolidated affiliates 797,391 807,721  
Total assets 24,169,802 22,576,606  
Capital expenditures 242,188 172,829  
Natural Gas Gathering and Processing Intersegment [Member] | Natural Gas Gathering And Processing [Member]      
Segment disclosure [Abstract]      
Revenues 1,000,000 481,600  
Natural Gas Liquids Regulated [Member] | Natural Gas Liquids      
Segment disclosure [Abstract]      
Revenues 603,900 570,600  
Cost of sales and fuel (exclusive of depreciation and operating costs) (146,000) (135,800)  
Natural Gas Liquids Regulated [Member] | Natural Gas Liquids | Operating Segments [Member]      
Segment disclosure [Abstract]      
Revenues 547,300 516,100  
Natural Gas Pipelines Regulated [Member] | Natural Gas Pipelines      
Segment disclosure [Abstract]      
Revenues 92,600 181,400  
Cost of sales and fuel (exclusive of depreciation and operating costs) (16,100) (12,800)  
Noncustomer [Domain]      
Segment disclosure [Abstract]      
Revenues (174,700) (132,200)  
NGL and Condensate Sales [Member]      
Segment disclosure [Abstract]      
Revenues 4,525,437 2,406,573  
NGL and Condensate Sales [Member] | Other and eliminations      
Segment disclosure [Abstract]      
Revenues (1,027,613) (500,064)  
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 1,004,349 491,807  
NGL and Condensate Sales [Member] | Natural Gas Liquids      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 4,548,701 2,414,830  
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 5,553,050 2,906,637  
Residue Natural Gas Sales [Member]      
Segment disclosure [Abstract]      
Revenues 577,125 427,702  
Residue Natural Gas Sales [Member] | Other and eliminations      
Segment disclosure [Abstract]      
Revenues (332) 0  
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 551,037 312,247  
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 26,420 115,455  
Residue Natural Gas Sales [Member] | Total Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 577,457 427,702  
Gathering, Processing and Exchange Services Revenue      
Segment disclosure [Abstract]      
Revenues 167,288 144,918  
Gathering, Processing and Exchange Services Revenue | Other and eliminations      
Segment disclosure [Abstract]      
Revenues 0 0  
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 31,445 31,687  
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 135,843 113,231  
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 167,288 144,918  
Transportation and Storage Revenue [Member]      
Segment disclosure [Abstract]      
Revenues 167,508 178,140  
Transportation and Storage Revenue [Member] | Other and eliminations      
Segment disclosure [Abstract]      
Revenues (2,025) (3,535)  
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 46,822 48,728  
Transportation and Storage Revenue [Member] | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 122,711 132,947  
Transportation and Storage Revenue [Member] | Total Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 169,533 181,675  
Other [Member]      
Segment disclosure [Abstract]      
Revenues 7,251 37,346  
Other [Member] | Other and eliminations      
Segment disclosure [Abstract]      
Revenues (663) (342)  
Other [Member] | Natural Gas Gathering And Processing [Member]      
Segment disclosure [Abstract]      
Revenues 4,839 4,000  
Other [Member] | Natural Gas Liquids      
Segment disclosure [Abstract]      
Revenues 2,869 33,276  
Other [Member] | Natural Gas Pipelines      
Segment disclosure [Abstract]      
Revenues 206 412  
Other [Member] | Total Segments [Member]      
Segment disclosure [Abstract]      
Revenues $ 7,914 $ 37,688