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SEGMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Segment disclosure [Abstract]          
Revenues $ 3,393,890 $ 2,906,366 $ 9,456,496 $ 8,381,749  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,560,765) (2,229,416) (7,104,609) (6,464,281)  
Operating costs (230,371) (204,334) (670,728) (608,627)  
Equity in net earnings (loss) from investments 39,313 40,058 116,070 118,985  
Depreciation and amortization (107,383) (102,298) (317,908) (302,566)  
Total assets 17,911,314 16,764,841 17,911,314 16,764,841 $ 16,845,937
Capital expenditures 694,303 135,199 1,309,655 330,431  
Net income 313,916 166,531 862,144 528,707  
Interest expense, net of capitalized interest 121,910 126,533 351,131 361,468  
Income taxes 102,983 97,128 266,285 195,913  
Impairment charges 0 (20,240) 0 (20,240)  
Noncash compensation expense 5,829 4,883 27,195 9,790  
Other corporate costs and noncash items (3,290) 5,783 (5,384) 52,096  
Noncash Contribution Expense     0 12,600  
Business Combination, Acquisition Related Costs       29,500  
Series E Preferred Stock [Member]          
Segment disclosure [Abstract]          
Noncash Contribution Expense       20,000  
Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues 791,255 782,928 2,200,175 2,130,019  
Cost of sales and fuel (exclusive of depreciation and operating costs) (542,463) (566,988) (1,478,044) (1,544,263)  
Operating costs (90,970) (79,559) (272,931) (223,546)  
Equity in net earnings (loss) from investments 74 3,433 948 9,843  
Noncash compensation expense and other 1,703 2,136 6,868 2,125  
Segment adjusted EBITDA 159,599 141,950 457,016 374,178  
Depreciation and amortization (49,223) (46,842) (145,120) (137,843)  
Total assets 5,811,140 5,385,778 5,811,140 5,385,778  
Capital expenditures 213,034 85,542 433,605 185,713  
Impairment charges   (20,240)   (20,240)  
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member]          
Segment disclosure [Abstract]          
Revenues 519,700   1,366,000    
Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues 3,026,288 2,501,979 8,332,687 7,243,648  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,544,854) (2,136,207) (7,009,438) (6,188,501)  
Operating costs (101,126) (89,803) (289,328) (255,220)  
Equity in net earnings (loss) from investments 16,450 15,287 49,456 44,071  
Noncash compensation expense and other 2,268 2,663 9,789 1,459  
Segment adjusted EBITDA 399,026 293,919 1,093,166 845,457  
Depreciation and amortization (43,688) (41,929) (128,993) (124,471)  
Total assets 9,632,212 8,515,535 9,632,212 8,515,535  
Capital expenditures 444,780 27,024 786,635 59,813  
Impairment charges   0   0  
Natural Gas Liquids [Member] | Natural Gas Liquids Intersegment [Member]          
Segment disclosure [Abstract]          
Revenues 7,400   20,100    
Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]          
Segment disclosure [Abstract]          
Revenues 316,000 293,100 910,300 878,800  
Cost of sales and fuel (exclusive of depreciation and operating costs) (132,700) (124,200) (379,500) (359,600)  
Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues 105,194 106,438 314,897 311,105  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,384) (10,614) (10,475) (33,990)  
Operating costs (36,543) (29,568) (104,692) (91,813)  
Equity in net earnings (loss) from investments 22,789 21,338 65,666 65,071  
Noncash compensation expense and other 1,050 (67) 3,701 772  
Segment adjusted EBITDA 90,106 87,527 269,097 251,145  
Depreciation and amortization (13,625) (12,765) (41,320) (37,906)  
Total assets 2,109,897 2,040,445 2,109,897 2,040,445  
Capital expenditures 31,522 18,811 71,897 70,671  
Impairment charges   0   0  
Natural Gas Pipelines [Member] | Natural Gas Pipelines Intersegment [Member]          
Segment disclosure [Abstract]          
Revenues 2,400   7,000    
Natural Gas Pipelines [Member] | Natural Gas Pipelines Regulated [Member]          
Segment disclosure [Abstract]          
Revenues 65,900 65,600 198,400 197,300  
Cost of sales and fuel (exclusive of depreciation and operating costs) (5,500) (10,500) (20,400) (32,900)  
Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues 3,922,737 3,391,345 10,847,759 9,684,772  
Cost of sales and fuel (exclusive of depreciation and operating costs) (3,089,701) (2,713,809) (8,497,957) (7,766,754)  
Operating costs (228,639) (198,930) (666,951) (570,579)  
Equity in net earnings (loss) from investments 39,313 40,058 116,070 118,985  
Noncash compensation expense and other 5,021 4,732 20,358 4,356  
Segment adjusted EBITDA 648,731 523,396 1,819,279 1,470,780  
Depreciation and amortization (106,536) (101,536) (315,433) (300,220)  
Total assets 17,553,249 15,941,758 17,553,249 15,941,758  
Capital expenditures 689,336 131,377 1,292,137 316,197  
Impairment charges   (20,240)   (20,240)  
Other and Eliminations          
Segment disclosure [Abstract]          
Revenues (528,847) (484,979) (1,391,263) (1,303,023)  
Cost of sales and fuel (exclusive of depreciation and operating costs) 528,936 484,393 1,393,348 1,302,473  
Operating costs (1,732) (5,404) (3,777) (38,048)  
Equity in net earnings (loss) from investments 0 0 0 0  
Depreciation and amortization (847) (762) (2,475) (2,346)  
Total assets 358,065 823,083 358,065 823,083  
Capital expenditures 4,967 3,822 17,518 14,234  
Impairment charges   0   0  
Unaffiliated entity [Member]          
Segment disclosure [Abstract]          
Revenues   2,906,366   8,381,749  
Unaffiliated entity [Member] | Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues   453,432   1,286,669  
Unaffiliated entity [Member] | Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues   2,348,052   6,788,451  
Unaffiliated entity [Member] | Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues   104,340   305,019  
Unaffiliated entity [Member] | Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues   2,905,824   8,380,139  
Unaffiliated entity [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues   542   1,610  
Operating Segments [Member]          
Segment disclosure [Abstract]          
Revenues   0   0  
Operating Segments [Member] | Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues   329,496   843,350  
Operating Segments [Member] | Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues   153,927   455,197  
Operating Segments [Member] | Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]          
Segment disclosure [Abstract]          
Revenues 276,400 250,200 784,800 752,500  
Operating Segments [Member] | Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues   2,098   6,086  
Operating Segments [Member] | Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues   485,521   1,304,633  
Operating Segments [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues   $ (485,521)   $ (1,304,633)  
Noncustomer [Domain]          
Segment disclosure [Abstract]          
Revenues (17,700)   (32,100)    
NGL and Condensate Sales [Member]          
Segment disclosure [Abstract]          
Revenues 2,836,661   7,862,478    
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 501,163   1,362,159    
NGL and Condensate Sales [Member] | Natural Gas Liquids [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,861,896   7,884,183    
NGL and Condensate Sales [Member] | Natural Gas Pipelines [Member]          
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 3,363,059   9,246,342    
NGL and Condensate Sales [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues (526,398)   (1,383,864)    
Residue Natural Gas Sales [Member]          
Segment disclosure [Abstract]          
Revenues 246,237   714,172    
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 245,474   709,089    
Residue Natural Gas Sales [Member] | Natural Gas Liquids [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 0   0    
Residue Natural Gas Sales [Member] | Natural Gas Pipelines [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 763   5,861    
Residue Natural Gas Sales [Member] | Total Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 246,237   714,950    
Residue Natural Gas Sales [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues 0   (778)    
Gathering and Exchange Services Revenue [Member]          
Segment disclosure [Abstract]          
Revenues 157,934   418,871    
Gathering and Exchange Services Revenue [Member] | Natural Gas Gathering And Processing [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 41,101   122,331    
Gathering and Exchange Services Revenue [Member] | Natural Gas Liquids [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 116,833   296,561    
Gathering and Exchange Services Revenue [Member] | Natural Gas Pipelines [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 0   0    
Gathering and Exchange Services Revenue [Member] | Total Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 157,934   418,892    
Gathering and Exchange Services Revenue [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues 0   (21)    
Transportation and Storage Revenue [Member]          
Segment disclosure [Abstract]          
Revenues 140,912   426,428    
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 [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 45,251   143,741    
Transportation and Storage Revenue [Member] | Natural Gas Pipelines [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 98,031   289,646    
Transportation and Storage Revenue [Member] | Total Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 143,282   433,387    
Transportation and Storage Revenue [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues (2,370)   (6,959)    
Other [Member]          
Segment disclosure [Abstract]          
Revenues 12,146   34,547    
Other [Member] | Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues 3,517   6,596    
Other [Member] | Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues 2,308   8,202    
Other [Member] | Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues 6,400   19,390    
Other [Member] | Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues 12,225   34,188    
Other [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues $ (79)   $ 359