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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 84,464 | $ 37,193 | $ 11,676 | $ 248,875
Accounts receivable, net | 1,085,075 | 1,202,951 |  |
Materials and supplies | 128,574 | 90,301 |  |
Natural gas and natural gas liquids in storage | 426,293 | 342,293 |  |
Other current assets | 61,340 | 53,008 |  |
Total current assets | 1,807,908 | 1,764,458 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 17,120,187 | 15,559,667 |  |
Accumulated depreciation and amortization | 3,159,660 | 2,861,541 |  |
Net property, plant and equipment | 13,960,527 | 12,698,126 |  |
Investments and other assets |  |  |  |
Investments | 981,592 | 1,003,156 |  |
Goodwill and intangible assets | 970,117 | 993,460 |  |
Other assets | 191,170 | 180,830 |  |
Total investments and other assets | 2,142,879 | 2,383,353 |  |
Total assets | 17,911,314 | 16,845,937 | 16,764,841 |
Current liabilities |  |  |  |
Current maturities of long-term debt | 507,650 | 432,650 |  |
Short-term borrowings | 120,000 | 614,673 |  |
Accounts payable | 1,339,507 | 1,140,571 |  |
Other current liabilities | 208,312 | 179,971 |  |
Total current liabilities | 2,450,206 | 2,667,335 |  |
Long-term debt, excluding current maturities | 8,325,708 | 8,091,629 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 132,242 | 52,697 |  |
Other deferred credits | 350,400 | 348,924 |  |
Total deferred credits and other liabilities | 482,642 | 401,621 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 6,652,758 | 5,527,867 |  |
Noncontrolling interests in consolidated subsidiaries | 0 | 157,485 |  |
Total equity | 6,652,758 | 5,685,352 | 5,516,383 | 3,428,915
Total liabilities and equity | 17,911,314 | 16,845,937 |  |
Reportable Legal Entities | Parent Issuer & Guarantor |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 84,500 | 37,200 | 11,700 | 248,500
Accounts receivable, net | 0 | 0 |  |
Materials and supplies | 0 | 0 |  |
Natural gas and natural gas liquids in storage | 0 | 0 |  |
Other current assets | 10,400 | 9,800 |  |
Total current assets | 94,900 | 47,000 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 141,000 | 128,300 |  |
Accumulated depreciation and amortization | 90,500 | 86,400 |  |
Net property, plant and equipment | 50,500 | 41,900 |  |
Investments and other assets |  |  |  |
Investments | 5,977,500 | 5,752,100 |  |
Intercompany notes receivable | 4,769,100 | 2,926,900 |  |
Other assets | 174,300 | 416,900 |  |
Total investments and other assets | 10,920,900 | 9,095,900 |  |
Total assets | 11,066,300 | 9,184,800 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings | 120,000 | 614,700 |  |
Accounts payable | 5,100 | 12,000 |  |
Other current liabilities | 71,800 | 65,900 |  |
Total current liabilities | 196,900 | 692,600 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 3,962,200 | 2,726,400 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 25,800 | 0 |  |
Other deferred credits | 228,600 | 237,900 |  |
Total deferred credits and other liabilities | 254,400 | 237,900 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | 5,527,900 |  |
Noncontrolling interests in consolidated subsidiaries |  | 0 |  |
Total equity | 6,652,800 | 5,527,900 |  |
Total liabilities and equity | 11,066,300 | 9,184,800 |  |
Reportable Legal Entities | Subsidiary Issuer & Guarantor |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 0 | 0 |  |
Materials and supplies | 0 | 0 |  |
Natural gas and natural gas liquids in storage | 0 | 0 |  |
Other current assets | 0 | 1,300 |  |
Total current assets | 0 | 1,300 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 0 | 0 |  |
Accumulated depreciation and amortization | 0 | 0 |  |
Net property, plant and equipment | 0 | 0 |  |
Investments and other assets |  |  |  |
Investments | 3,359,000 | 3,133,700 |  |
Intercompany notes receivable | 7,682,500 | 8,627,800 |  |
Other assets | 0 | 200 |  |
Total investments and other assets | 11,041,500 | 11,761,700 |  |
Total assets | 11,041,500 | 11,763,000 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 500,000 | 425,000 |  |
Short-term borrowings | 0 | 0 |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 67,600 | 85,000 |  |
Total current liabilities | 567,600 | 510,000 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 4,340,400 | 5,336,400 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 0 | 0 |  |
Other deferred credits | 0 | 0 |  |
Total deferred credits and other liabilities | 0 | 0 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | 5,916,600 |  |
Noncontrolling interests in consolidated subsidiaries |  | 0 |  |
Total equity | 6,133,500 | 5,916,600 |  |
Total liabilities and equity | 11,041,500 | 11,763,000 |  |
Reportable Legal Entities | Guarantor Subsidiary |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 400
Accounts receivable, net | 0 | 0 |  |
Materials and supplies | 0 | 0 |  |
Natural gas and natural gas liquids in storage | 0 | 0 |  |
Other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 0 | 0 |  |
Accumulated depreciation and amortization | 0 | 0 |  |
Net property, plant and equipment | 0 | 0 |  |
Investments and other assets |  |  |  |
Investments | 9,223,200 | 8,058,400 |  |
Intercompany notes receivable | 1,818,300 | 3,703,100 |  |
Other assets | 0 | 0 |  |
Total investments and other assets | 11,041,500 | 11,761,500 |  |
Total assets | 11,041,500 | 11,761,500 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings | 0 | 0 |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Intercompany debt | 7,682,500 | 8,627,800 |  |
Long-term debt, excluding current maturities | 0 | 0 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 0 | 0 |  |
Other deferred credits | 0 | 0 |  |
Total deferred credits and other liabilities | 0 | 0 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | 3,133,700 |  |
Noncontrolling interests in consolidated subsidiaries |  | 0 |  |
Total equity | 3,359,000 | 3,133,700 |  |
Total liabilities and equity | 11,041,500 | 11,761,500 |  |
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 1,085,100 | 1,203,000 |  |
Materials and supplies | 128,600 | 90,300 |  |
Natural gas and natural gas liquids in storage | 426,300 | 342,300 |  |
Other current assets | 73,000 | 80,600 |  |
Total current assets | 1,713,000 | 1,716,200 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 16,979,200 | 15,431,300 |  |
Accumulated depreciation and amortization | 3,069,200 | 2,775,100 |  |
Net property, plant and equipment | 13,910,000 | 12,656,200 |  |
Investments and other assets |  |  |  |
Investments | 796,800 | 803,000 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 988,200 | 1,007,400 |  |
Total investments and other assets | 1,785,000 | 1,810,400 |  |
Total assets | 17,408,000 | 16,182,800 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 7,700 | 7,700 |  |
Short-term borrowings | 0 | 0 |  |
Accounts payable | 1,334,400 | 1,128,600 |  |
Other current liabilities | 343,600 | 328,400 |  |
Total current liabilities | 1,685,700 | 1,464,700 |  |
Intercompany debt | 6,587,400 | 6,630,000 |  |
Long-term debt, excluding current maturities | 23,100 | 28,800 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 107,600 | 97,100 |  |
Other deferred credits | 121,800 | 111,000 |  |
Total deferred credits and other liabilities | 229,400 | 208,100 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | 7,693,700 |  |
Noncontrolling interests in consolidated subsidiaries |  | 157,500 |  |
Total equity | 8,882,400 | 7,851,200 |  |
Total liabilities and equity | 17,408,000 | 16,182,800 |  |
Reportable Legal Entities | Total |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 84,500 | 37,200 | 11,700 | 248,900
Accounts receivable, net | 1,085,100 | 1,203,000 |  |
Materials and supplies | 128,600 | 90,300 |  |
Natural gas and natural gas liquids in storage | 426,300 | 342,300 |  |
Other current assets | 83,400 | 91,700 |  |
Total current assets | 1,807,900 | 1,764,500 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 17,120,200 | 15,559,600 |  |
Accumulated depreciation and amortization | 3,159,700 | 2,861,500 |  |
Net property, plant and equipment | 13,960,500 | 12,698,100 |  |
Investments and other assets |  |  |  |
Investments | 981,600 | 1,003,200 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 1,161,300 | 1,380,100 |  |
Total investments and other assets | 2,142,900 | 2,383,300 |  |
Total assets | 17,911,300 | 16,845,900 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 507,700 | 432,700 |  |
Short-term borrowings | 120,000 | 614,700 |  |
Accounts payable | 1,339,500 | 1,140,600 |  |
Other current liabilities | 483,000 | 479,300 |  |
Total current liabilities | 2,450,200 | 2,667,300 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 8,325,700 | 8,091,600 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 132,200 | 52,700 |  |
Other deferred credits | 350,400 | 348,900 |  |
Total deferred credits and other liabilities | 482,600 | 401,600 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | 5,527,900 |  |
Noncontrolling interests in consolidated subsidiaries |  | 157,500 |  |
Total equity | 6,652,800 | 5,685,400 |  |
Total liabilities and equity | 17,911,300 | 16,845,900 |  |
Consolidating Entries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Accounts receivable, net | 0 | 0 |  |
Materials and supplies | 0 | 0 |  |
Natural gas and natural gas liquids in storage | 0 | 0 |  |
Other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 0 | 0 |  |
Accumulated depreciation and amortization | 0 | 0 |  |
Net property, plant and equipment | 0 | 0 |  |
Investments and other assets |  |  |  |
Investments | (18,374,900) | (16,744,000) |  |
Intercompany notes receivable | (14,269,900) | (15,257,800) |  |
Other assets | (1,200) | (44,400) |  |
Total investments and other assets | (32,646,000) | (32,046,200) |  |
Total assets | (32,646,000) | (32,046,200) |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings | 0 | 0 |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Intercompany debt | (14,269,900) | (15,257,800) |  |
Long-term debt, excluding current maturities | 0 | 0 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | (1,200) | (44,400) |  |
Other deferred credits | 0 | 0 |  |
Total deferred credits and other liabilities | (1,200) | (44,400) |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | (16,744,000) |  |
Noncontrolling interests in consolidated subsidiaries |  | 0 |  |
Total equity | (18,374,900) | (16,744,000) |  |
Total liabilities and equity | $ (32,646,000) | $ (32,046,200) |  |

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