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SEGMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Segment Reporting, Disclosure of Major Customers                 For the year ended December 31, 2018, we had no single customer from which we received 10 percent or more of our consolidated revenues. For the year ended December 31, 2017, we had no single customer from which we received 10 percent or more of our consolidated revenues. For the year ended December 31, 2016, we had no single customer from which we received 10 percent or more of our consolidated revenues.
Total revenues $ 3,136,700 $ 3,393,890 $ 2,960,529 $ 3,102,077 $ 3,792,158 $ 2,906,366 $ 2,725,772 $ 2,749,611 $ 12,593,196 $ 12,173,907 $ 8,920,934
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (9,422,708) (9,538,045) (6,496,124)
Operating costs                 (907,068) (822,710) (747,082)
Equity in net earnings from investments                 158,383 159,278 139,690
Depreciation and amortization                 (428,557) (406,335) (391,585)
Impairment charges                 0 (20,240) 0
Noncash compensation expense                 37,954 13,421 31,981
Total assets 18,231,671       16,845,937       18,231,671 16,845,937 16,138,751
Capital expenditures                 2,141,475 512,393 624,634
Operating income                 1,835,464 1,391,771 1,295,778
Net income 292,888 $ 313,916 $ 282,179 $ 266,049 64,812 $ 166,531 $ 175,991 $ 186,185 1,155,032 593,519 743,499
Interest expense, net of capitalized interest                 469,620 485,658 469,651
Income taxes                 362,903 447,282 212,406
Other corporate costs and noncash items (a)                 (15,603) 46,774 (9,588)
Noncash Contribution Expense                 0 12,600 0
Business Combination, Acquisition Related Costs                   30,000  
Series E Preferred Stock [Member]                      
Segment Reporting Information [Line Items]                      
Noncash Contribution Expense                   20,000  
Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Total revenues                 3,034,577 3,026,574 2,051,577
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (2,041,448) (2,216,355) (1,331,542)
Operating costs                 (368,939) (307,376) (283,395)
Equity in net earnings from investments                 410 12,098 10,742
Noncash compensation expense and other                 7,007 3,531 (604)
Segment adjusted EBITDA                 631,607 518,472 446,778
Depreciation and amortization                 (196,090) (184,923) (178,548)
Impairment charges                   (20,240)  
Total assets 6,078,473       5,495,163       6,078,473 5,495,163 5,320,666
Capital expenditures                 694,611 284,205 410,485
Natural Gas Gathering And Processing | Natural Gas Gathering and Processing Intersegment [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,768,800    
Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Total revenues                 10,934,578 10,626,204 7,675,654
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (9,176,813) (9,176,494) (6,321,377)
Operating costs                 (394,115) (358,278) (326,056)
Equity in net earnings from investments                 67,126 59,876 54,513
Noncash compensation expense and other                 9,829 3,631 (3,115)
Segment adjusted EBITDA                 1,440,605 1,154,939 1,079,619
Depreciation and amortization                 (174,007) (167,277) (163,303)
Impairment charges                   0  
Total assets 9,663,640       8,782,700       9,663,640 8,782,700 8,347,961
Capital expenditures                 1,306,341 114,267 105,861
Natural Gas Liquids | Natural Gas Liquids Intersegment [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 28,700    
Natural Gas Liquids | Natural Gas Liquids Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,200,000 1,200,000 1,200,000
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (506,000) (497,400) (458,700)
Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Total revenues                 431,735 419,932 379,361
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (15,984) (43,424) (30,561)
Operating costs                 (144,259) (125,308) (114,658)
Equity in net earnings from investments                 90,847 87,304 74,435
Noncash compensation expense and other                 3,912 1,314 4,560
Segment adjusted EBITDA                 366,251 339,818 313,137
Depreciation and amortization                 (55,118) (51,025) (46,718)
Impairment charges                   0  
Total assets 2,131,669       2,055,020       2,131,669 2,055,020 1,946,318
Capital expenditures                 119,185 95,564 96,274
Natural Gas Pipelines | Natural Gas Pipelines Intersegment [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 12,600    
Natural Gas Pipelines | Natural Gas Pipelines Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 266,600 264,900 238,700
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (26,000) (44,000) (30,000)
Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 14,400,890 14,072,710 10,106,592
Cost of sales and fuel (exclusive of depreciation and operating costs)                 (11,234,245) (11,436,273) (7,683,480)
Operating costs                 (907,313) (790,962) (724,109)
Equity in net earnings from investments                 158,383 159,278 139,690
Noncash compensation expense and other                 20,748 8,476 841
Segment adjusted EBITDA                 2,438,463 2,013,229 1,839,534
Depreciation and amortization                 (425,215) (403,225) (388,569)
Impairment charges                   (20,240)  
Total assets 17,873,782       16,332,883       17,873,782 16,332,883 15,614,945
Capital expenditures                 2,120,137 494,036 612,620
Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 (1,807,694) (1,898,803) (1,185,658)
Cost of sales and fuel (exclusive of depreciation and operating costs)                 1,811,537 1,898,228 1,187,356
Operating costs                 245 (31,748) (22,973)
Equity in net earnings from investments                 0 0 0
Depreciation and amortization                 (3,342) (3,110) (3,016)
Impairment charges                   0  
Total assets $ 357,889       $ 513,054       357,889 513,054 523,806
Capital expenditures                 21,338 18,357 12,014
Unaffiliated entity [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                   12,173,907 8,920,934
Unaffiliated entity [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Total revenues                   1,750,655 1,375,738
Unaffiliated entity [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Total revenues                   10,009,576 7,168,983
Unaffiliated entity [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Total revenues                   411,490 373,738
Unaffiliated entity [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                   12,171,721 8,918,459
Unaffiliated entity [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                   2,186 2,475
Intersegment [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                   0 0
Intersegment [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Total revenues                   1,275,919 675,839
Intersegment [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Total revenues                   616,628 506,671
Intersegment [Member] | Natural Gas Liquids | Natural Gas Liquids Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,100,000 1,000,000 992,800
Intersegment [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Total revenues                   8,442 5,623
Intersegment [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                   1,900,989 1,188,133
Intersegment [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                   $ (1,900,989) $ (1,188,133)
Noncustomer [Domain]                      
Segment Reporting Information [Line Items]                      
Total revenues                 (16,200)    
NGL and Condensate Sales [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 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                 1,775,991    
NGL and Condensate Sales [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 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    
NGL and Condensate Sales [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 12,095,838    
NGL and Condensate Sales [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 (1,794,342)    
Residue Natural Gas Sales [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 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                 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    
Residue Natural Gas Sales [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 9,772    
Residue Natural Gas Sales [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,093,934    
Residue Natural Gas Sales [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 (2,832)    
Gathering and Exchange Services Revenue [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 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                 163,194    
Gathering and Exchange Services Revenue [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 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    
Gathering and Exchange Services Revenue [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 568,091    
Gathering and Exchange Services Revenue [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 (21)    
Transportation and Storage Revenue [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 583,426    
Transportation and Storage Revenue [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0    
Transportation and Storage Revenue [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 199,018    
Transportation and Storage Revenue [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 394,014    
Transportation and Storage Revenue [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 593,032    
Transportation and Storage Revenue [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 (9,606)    
Other [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 49,102    
Other [Member] | Natural Gas Gathering And Processing                      
Segment Reporting Information [Line Items]                      
Total revenues                 11,230    
Other [Member] | Natural Gas Liquids                      
Segment Reporting Information [Line Items]                      
Total revenues                 10,816    
Other [Member] | Natural Gas Pipelines                      
Segment Reporting Information [Line Items]                      
Total revenues                 27,949    
Other [Member] | Total Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 49,995    
Other [Member] | Other and Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ (893)