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SEGMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Segment Reporting, Disclosure of Major Customers                 10 10 10
Operating costs                 $ (886,204) $ (982,864) $ (907,068)
Equity in net earnings (loss) from investments                 143,241 154,541 158,383
Depreciation and amortization                 (578,662) (476,535) (428,557)
Impairment charges       $ (641,800)         (644,930) 0 0
Investments in unconsolidated affiliates (Note M) $ 805,032       $ 861,844       805,032 861,844 969,150
Noncash compensation expense                 8,540 26,699 37,954
Total assets 23,078,754       21,812,121       23,078,754 21,812,121 18,231,671
Capital expenditures                 2,195,381 3,848,349 2,141,475
Operating income (loss) 538,663 $ 550,433 $ 355,730 (83,469) 487,314 $ 482,151 $ 476,146 $ 468,742 1,361,357 1,914,353 1,835,464
Net income 308,029 312,316 134,321 (141,857) 320,251 309,155 311,963 337,208 612,809 1,278,577 1,155,032
Interest expense, net of capitalized interest                 712,886 491,773 469,620
Income tax expense                 189,507 372,414 362,903
Other corporate costs and equity AFUDC                 (42,631) (68,767) (15,603)
Revenues 2,570,577 $ 2,174,264 $ 1,660,729 $ 2,136,672 2,663,606 $ 2,263,228 $ 2,457,575 $ 2,779,958 8,542,242 10,164,367 12,593,196
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (5,110,146) (6,788,040) (9,422,708)
Gain (Loss) on Extinguishment of Debt                 22,300    
Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Operating costs                 (326,938) (368,352) (368,939)
Equity in net earnings (loss) from investments                 (1,123) (6,292) 410
Noncash compensation expense and other                 1,952 10,965 7,007
Segment adjusted EBITDA                 650,036 702,650 631,607
Depreciation and amortization                 (247,010) (219,519) (196,090)
Impairment charges                 (566,145)    
Investments in unconsolidated affiliates (Note M) 22,757       34,426       22,757 34,426 42,630
Total assets 6,499,908       6,795,744       6,499,908 6,795,744 6,078,473
Capital expenditures                 446,142 926,489 694,611
Revenues                 1,820,121 2,368,639 3,034,577
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (843,976) (1,302,310) (2,041,448)
Natural Gas Gathering And Processing | Natural Gas Gathering and Processing Intersegment [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 865,600 1,200,000 1,800,000
Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Operating costs                 (412,900) (456,892) (394,115)
Equity in net earnings (loss) from investments                 39,938 65,123 67,126
Noncash compensation expense and other                 8,748 15,936 9,829
Segment adjusted EBITDA                 1,617,241 1,465,765 1,440,605
Depreciation and amortization                 (271,900) (196,132) (174,007)
Impairment charges                 (78,785)    
Investments in unconsolidated affiliates (Note M) 423,494       439,393       423,494 439,393 451,040
Total assets 13,636,109       12,551,476       13,636,109 12,551,476 9,663,640
Capital expenditures                 1,655,759 2,796,604 1,306,341
Revenues                 7,090,013 8,532,516 10,934,578
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (5,108,558) (6,690,918) (9,176,813)
Natural Gas Liquids | Natural Gas Liquids Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 2,000,000 1,400,000 1,200,000
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (520,600) (496,800) (506,000)
Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Operating costs                 (141,713) (157,230) (144,259)
Equity in net earnings (loss) from investments                 104,426 95,710 90,847
Noncash compensation expense and other                 1,540 2,977 3,912
Segment adjusted EBITDA                 437,426 408,816 366,251
Depreciation and amortization                 (55,739) (57,250) (55,118)
Impairment charges                 0    
Investments in unconsolidated affiliates (Note M) 358,781       388,025       358,781 388,025 475,480
Total assets 2,100,213       2,094,072       2,100,213 2,094,072 2,131,669
Capital expenditures                 71,918 99,221 119,185
Revenues                 479,982 471,987 431,735
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (6,809) (4,628) (15,984)
Natural Gas Pipelines | Natural Gas Pipelines Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 298,500 285,300 266,600
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (30,400) (20,000) (26,000)
Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Operating costs                 (881,551) (982,474) (907,313)
Equity in net earnings (loss) from investments                 143,241 154,541 158,383
Noncash compensation expense and other                 12,240 29,878 20,748
Segment adjusted EBITDA                 2,704,703 2,577,231 2,438,463
Depreciation and amortization                 (574,649) (472,901) (425,215)
Impairment charges                 (644,930)    
Investments in unconsolidated affiliates (Note M) 805,032       861,844       805,032 861,844 969,150
Total assets 22,236,230       21,441,292       22,236,230 21,441,292 17,873,782
Capital expenditures                 2,173,819 3,822,314 2,120,137
Revenues                 9,390,116 11,373,142 14,400,890
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (5,959,343) (7,997,856) (11,234,245)
Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Operating costs                 (4,653) (390) 245
Equity in net earnings (loss) from investments                 0 0 0
Depreciation and amortization                 (4,013) (3,634) (3,342)
Impairment charges                 0    
Investments in unconsolidated affiliates (Note M) 0       0       0 0 0
Total assets $ 842,524       $ 370,829       842,524 370,829 357,889
Capital expenditures                 21,562 26,035 21,338
Revenues                 (847,874) (1,208,775) (1,807,694)
Cost of sales and fuel (exclusive of depreciation and operating costs)                 849,197 1,209,816 1,811,537
Operating Segments [Member] | Natural Gas Liquids | Natural Gas Liquids Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 1,800,000 1,200,000 1,100,000
Noncustomer [Domain]                      
Segment Reporting Information [Line Items]                      
Revenues                 65,800 139,600 (16,200)
NGL and Condensate Sales [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 6,477,869 7,944,787 10,301,496
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 889,388 1,224,378 1,775,991
NGL and Condensate Sales [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 6,409,332 7,910,833 10,319,847
NGL and Condensate Sales [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0 0 0
NGL and Condensate Sales [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 7,298,720 9,135,211 12,095,838
NGL and Condensate Sales [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 (820,851) (1,190,424) (1,794,342)
Residue Natural Gas Sales [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 769,319 965,975 1,091,102
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 771,486 966,149 1,084,162
Residue Natural Gas Sales [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0 0 0
Residue Natural Gas Sales [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 8,693 1,244 9,772
Residue Natural Gas Sales [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 780,179 967,393 1,093,934
Residue Natural Gas Sales [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 (10,860) (1,418) (2,832)
Gathering and Exchange Services Revenue [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 630,517 578,537 568,070
Gathering and Exchange Services Revenue [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 141,943 164,299 163,194
Gathering and Exchange Services Revenue [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 488,574 414,238 404,897
Gathering and Exchange Services Revenue [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0 0 0
Gathering and Exchange Services Revenue [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 630,517 578,537 568,091
Gathering and Exchange Services Revenue [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 0 0 (21)
Transportation and Storage Revenue [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 638,413 648,103 603,437
Transportation and Storage Revenue [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0 0 0
Transportation and Storage Revenue [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 182,915 197,483 199,018
Transportation and Storage Revenue [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 470,097 466,266 414,969
Transportation and Storage Revenue [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 653,012 663,749 613,987
Transportation and Storage Revenue [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 (14,599) (15,646) (10,550)
Other [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 26,124 26,965 29,091
Other [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Revenues                 17,304 13,813 11,230
Other [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenues                 9,192 9,962 10,816
Other [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Revenues                 1,192 4,477 6,994
Other [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 27,688 28,252 29,040
Other [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Revenues                 $ (1,564) $ (1,287) $ 51