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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 |  |

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