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SEGMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | $ 1,660,729 |  | $ 2,457,575 |  | $ 3,797,401 | $ 5,237,533 |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (940,458) |  | (1,625,794) |  | (2,217,386) | (3,582,171) |
Operating costs | (224,464) |  | (237,713) |  | (431,504) | (478,454) |
Equity in net earnings (loss) from investments | 25,328 |  | 34,118 |  | 69,955 | 77,599 |
Depreciation and amortization | (140,416) |  | (114,964) |  | (272,769) | (229,122) |
Impairment charges | 0 |  | 0 |  | (641,754) | 0 |
Total assets | 22,992,467 |  | 19,751,594 |  | 22,992,467 | 19,751,594 | $ 21,812,121
Capital expenditures | 594,282 |  | 830,459 |  | 1,543,961 | 1,720,164 |
Equity Method Investments | 790,035 |  | 881,084 |  | 790,035 | 881,084 | $ 861,844
Net income (loss) | 134,321 | $ (141,857) | 311,963 | $ 337,208 | (7,536) | 649,171 |
Interest expense, net of capitalized interest | 218,968 |  | 117,493 |  | 359,584 | 232,913 |
Income tax expense (benefit) | 43,140 |  | 98,935 |  | (12,255) | 176,869 |
Noncash compensation expense | 957 |  | 5,115 |  | (345) | 10,655 |
Other corporate costs and noncash items | (1,578) |  | (14,541) |  | (34,659) | (28,270) |
Gain (loss) on extinguishment of debt | 4,300 |  |  |  | 20,000 |  |
Natural Gas Gathering And Processing [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 299,809 |  | 582,180 |  | 749,789 | 1,276,841 |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (132,221) |  | (309,745) |  | (334,391) | (760,658) |
Operating costs | (78,668) |  | (85,762) |  | (163,138) | (180,009) |
Equity in net earnings (loss) from investments | (2,149) |  | (1,621) |  | (1,343) | (2,823) |
Noncash compensation expense and other | 1,978 |  | 1,571 |  | (2,520) | 5,516 |
Segment adjusted EBITDA | 88,749 |  | 186,623 |  | 248,397 | 338,867 |
Depreciation and amortization | (55,419) |  | (53,552) |  | (114,175) | (106,233) |
Impairment charges |  |  |  |  | (564,353) |  |
Total assets | 6,426,121 |  | 6,343,968 |  | 6,426,121 | 6,343,968 |
Capital expenditures | 118,171 |  | 213,222 |  | 299,781 | 428,370 |
Equity Method Investments | 2,250 |  | 37,793 |  | 2,250 | 37,793 |
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 108,200 |  | 317,900 |  | 321,500 | 653,700 |
Natural Gas Liquids |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 1,335,714 |  | 2,072,558 |  | 3,106,306 | 4,384,058 |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (905,154) |  | (1,629,573) |  | (2,183,908) | (3,476,246) |
Operating costs | (106,977) |  | (114,933) |  | (196,548) | (225,371) |
Equity in net earnings (loss) from investments | 7,797 |  | 15,972 |  | 23,065 | 33,516 |
Noncash compensation expense and other | 6,262 |  | 2,738 |  | (357) | 8,444 |
Segment adjusted EBITDA | 337,642 |  | 346,762 |  | 748,558 | 724,401 |
Depreciation and amortization | (69,065) |  | (46,346) |  | (126,906) | (92,747) |
Impairment charges |  |  |  |  | (77,401) |  |
Total assets | 13,183,168 |  | 10,694,485 |  | 13,183,168 | 10,694,485 |
Capital expenditures | 459,807 |  | 591,762 |  | 1,205,990 | 1,231,100 |
Equity Method Investments | 427,032 |  | 443,104 |  | 427,032 | 443,104 |
Natural Gas Liquids | Natural Gas Liquids Regulated [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 477,200 |  | 303,400 |  | 912,300 | 626,500 |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (117,100) |  | (116,900) |  | (237,500) | (235,400) |
Natural Gas Pipelines |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 122,058 |  | 117,531 |  | 242,841 | 233,931 |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (168) |  | (1,649) |  | (1,707) | (3,404) |
Operating costs | (33,092) |  | (36,605) |  | (66,399) | (72,873) |
Equity in net earnings (loss) from investments | 19,680 |  | 19,767 |  | 48,233 | 46,906 |
Noncash compensation expense and other | 1,355 |  | 1,500 |  | (611) | 2,632 |
Segment adjusted EBITDA | 109,833 |  | 100,544 |  | 222,357 | 207,192 |
Depreciation and amortization | (14,925) |  | (14,167) |  | (29,694) | (28,323) |
Impairment charges |  |  |  |  | 0 |  |
Total assets | 2,064,197 |  | 2,083,940 |  | 2,064,197 | 2,083,940 |
Capital expenditures | 10,910 |  | 21,406 |  | 27,500 | 50,094 |
Equity Method Investments | 360,753 |  | 400,187 |  | 360,753 | 400,187 |
Natural Gas Pipelines | Natural Gas Pipelines Regulated [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 79,900 |  | 72,300 |  | 153,800 | 142,400 |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (6,700) |  | (3,700) |  | (12,800) | (9,300) |
Total Segments [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 1,757,581 |  | 2,772,269 |  | 4,098,936 | 5,894,830 |
Cost of sales and fuel (exclusive of depreciation and operating costs) | (1,037,543) |  | (1,940,967) |  | (2,520,006) | (4,240,308) |
Operating costs | (218,737) |  | (237,300) |  | (426,085) | (478,253) |
Equity in net earnings (loss) from investments | 25,328 |  | 34,118 |  | 69,955 | 77,599 |
Noncash compensation expense and other | 9,595 |  | 5,809 |  | (3,488) | 16,592 |
Segment adjusted EBITDA | 536,224 |  | 633,929 |  | 1,219,312 | 1,270,460 |
Depreciation and amortization | (139,409) |  | (114,065) |  | (270,775) | (227,303) |
Impairment charges |  |  |  |  | (641,754) |  |
Total assets | 21,673,486 |  | 19,122,393 |  | 21,673,486 | 19,122,393 |
Capital expenditures | 588,888 |  | 826,390 |  | 1,533,271 | 1,709,564 |
Equity Method Investments | 790,035 |  | 881,084 |  | 790,035 | 881,084 |
Other and Eliminations |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | (96,852) |  | (314,694) |  | (301,535) | (657,297) |
Cost of sales and fuel (exclusive of depreciation and operating costs) | 97,085 |  | 315,173 |  | 302,620 | 658,137 |
Operating costs | (5,727) |  | (413) |  | (5,419) | (201) |
Equity in net earnings (loss) from investments | 0 |  | 0 |  | 0 | 0 |
Depreciation and amortization | (1,007) |  | (899) |  | (1,994) | (1,819) |
Impairment charges |  |  |  |  | 0 |  |
Total assets | 1,318,981 |  | 629,201 |  | 1,318,981 | 629,201 |
Capital expenditures | 5,394 |  | 4,069 |  | 10,690 | 10,600 |
Equity Method Investments | 0 |  | 0 |  | 0 | 0 |
Operating Segments [Member] | Natural Gas Liquids | Natural Gas Liquids Regulated [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 432,600 |  | 267,300 |  | 810,800 | 537,300 |
Noncustomer [Domain] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 18,800 |  | 18,600 |  | 99,000 | 40,900 |
NGL and Condensate Sales [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 1,195,194 |  | 1,923,794 |  | 2,812,350 | 4,075,878 |
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 109,581 |  | 312,757 |  | 329,498 | 645,089 |
NGL and Condensate Sales [Member] | Natural Gas Liquids |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,174,580 |  | 1,921,564 |  | 2,771,291 | 4,079,667 |
NGL and Condensate Sales [Member] | Natural Gas Pipelines |  |  |  |  |  |  |
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 | 1,284,161 |  | 2,234,321 |  | 3,100,789 | 4,724,756 |
NGL and Condensate Sales [Member] | Other and Eliminations |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | (88,967) |  | (310,527) |  | (288,439) | (648,878) |
Residue Natural Gas Sales [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 146,961 |  | 221,374 |  | 337,015 | 541,380 |
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 150,892 |  | 221,333 |  | 339,943 | 540,369 |
Residue Natural Gas Sales [Member] | Natural Gas Liquids |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 |  | 41 |  | 2,035 | 1,011 |
Residue Natural Gas Sales [Member] | Total Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 150,892 |  | 221,374 |  | 341,978 | 541,380 |
Residue Natural Gas Sales [Member] | Other and Eliminations |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | (3,931) |  | 0 |  | (4,963) | 0 |
Gathering, Processing and Exchange Services Revenue |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 154,123 |  | 149,394 |  | 312,596 | 287,670 |
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 | 35,949 |  | 43,536 |  | 73,886 | 83,278 |
Gathering, Processing and Exchange Services Revenue | Natural Gas Liquids |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 118,174 |  | 105,858 |  | 238,710 | 204,392 |
Gathering, Processing and Exchange Services Revenue | Natural Gas Pipelines |  |  |  |  |  |  |
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 | 154,123 |  | 149,394 |  | 312,596 | 287,670 |
Gathering, Processing and Exchange Services Revenue | Other and Eliminations |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 0 |  | 0 |  | 0 | 0 |
Transportation and Storage Revenue [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 159,031 |  | 156,015 |  | 324,341 | 317,265 |
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 |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 40,881 |  | 42,655 |  | 91,636 | 94,977 |
Transportation and Storage Revenue [Member] | Natural Gas Pipelines |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 121,777 |  | 117,240 |  | 240,141 | 230,105 |
Transportation and Storage Revenue [Member] | Total Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 162,658 |  | 159,895 |  | 331,777 | 325,082 |
Transportation and Storage Revenue [Member] | Other and Eliminations |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | (3,627) |  | (3,880) |  | (7,436) | (7,817) |
Other [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 5,420 |  | 6,998 |  | 11,099 | 15,340 |
Other [Member] | Natural Gas Gathering And Processing [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 3,387 |  | 4,554 |  | 6,462 | 8,105 |
Other [Member] | Natural Gas Liquids |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 2,079 |  | 2,481 |  | 4,669 | 5,022 |
Other [Member] | Natural Gas Pipelines |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 281 |  | 250 |  | 665 | 2,815 |
Other [Member] | Total Segments [Member] |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | 5,747 |  | 7,285 |  | 11,796 | 15,942 |
Other [Member] | Other and Eliminations |  |  |  |  |  |  |
Segment disclosure [Abstract] |  |  |  |  |  |  |
Revenues | $ (327) |  | $ (287) |  | $ (697) | $ (602) |

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