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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION CONDENSED CONSOLIDATING FINANCIAL STATEMENTS, Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 11,975 | $ 37,193 | $ 248,875 | $ 97,619
Accounts receivable, net | 818,958 | 1,202,951 |  |
Materials and supplies | 141,174 | 90,301 |  |
Natural gas and natural gas liquids in storage | 296,667 | 342,293 |  |
Other current assets | 100,808 | 53,008 |  |
Total current assets | 1,398,632 | 1,764,458 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 18,030,963 | 15,559,667 |  |
Accumulated depreciation and amortization | 3,264,312 | 2,861,541 |  |
Net property, plant and equipment | 14,766,651 | 12,698,126 |  |
Investments and other assets |  |  |  |
Investments | 969,150 | 1,003,156 |  |
Other assets | 130,096 | 180,830 |  |
Total investments and other assets | 2,066,388 | 2,383,353 |  |
Total assets | 18,231,671 | 16,845,937 | 16,138,751 |
Current liabilities |  |  |  |
Current maturities of long-term debt | 507,650 | 432,650 |  |
Short-term borrowings | 0 | 614,673 |  |
Accounts payable | 1,118,102 | 1,140,571 |  |
Other current liabilities | 211,110 | 179,971 |  |
Total current liabilities | 2,108,436 | 2,667,335 |  |
Long-term debt, excluding current maturities | 8,873,334 | 8,091,629 |  |
Deferred income taxes | 219,731 | 52,697 |  |
Other deferred credits | 450,627 | 348,924 |  |
Deferred credits and other liabilities | 670,358 | 401,621 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 6,579,543 | 5,527,867 |  |
Noncontrolling interests in consolidated subsidiaries | 0 | 157,485 |  |
Total equity | 6,579,543 | 5,685,352 | 3,428,915 | 3,766,336
Total liabilities and equity | 18,231,671 | 16,845,937 |  |
Reportable Legal Entities | Parent Issuer & Guarantor |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 12,000 | 37,200 | 248,500 | 92,500
Accounts receivable, net | 0 | 0 |  |
Materials and supplies | 0 | 0 |  |
Natural gas and natural gas liquids in storage | 0 | 0 |  |
Other current assets | 29,100 | 9,800 |  |
Total current assets | 41,100 | 47,000 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 145,500 | 128,300 |  |
Accumulated depreciation and amortization | 92,000 | 86,400 |  |
Net property, plant and equipment | 53,500 | 41,900 |  |
Investments and other assets |  |  |  |
Investments | 6,153,500 | 5,752,100 |  |
Intercompany notes receivable | 5,308,600 | 2,926,900 |  |
Other assets | 115,900 | 416,900 |  |
Total investments and other assets | 11,578,000 | 9,095,900 |  |
Total assets | 11,672,600 | 9,184,800 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings |  | 614,700 |  |
Accounts payable | 31,300 | 12,000 |  |
Other current liabilities | 123,200 | 65,900 |  |
Total current liabilities | 154,500 | 692,600 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 4,510,700 | 2,726,400 |  |
Deferred income taxes | 112,300 | 0 |  |
Other deferred credits | 315,600 | 237,900 |  |
Deferred credits and other liabilities | 427,900 | 237,900 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | 5,527,900 |  |
Noncontrolling interests in consolidated subsidiaries |  | 0 |  |
Total equity | 6,579,500 | 5,527,900 |  |
Total liabilities and equity | 11,672,600 | 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 | 3,548,100 | 3,133,700 |  |
Intercompany notes receivable | 7,701,500 | 8,627,800 |  |
Other assets | 0 | 200 |  |
Total investments and other assets | 11,249,600 | 11,761,700 |  |
Total assets | 11,249,600 | 11,763,000 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 500,000 | 425,000 |  |
Short-term borrowings |  | 0 |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 81,000 | 85,000 |  |
Total current liabilities | 581,000 | 510,000 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 4,341,400 | 5,336,400 |  |
Deferred income taxes | 0 | 0 |  |
Other deferred credits | 0 | 0 |  |
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 | 6,327,200 | 5,916,600 |  |
Total liabilities and equity | 11,249,600 | 11,763,000 |  |
Reportable Legal Entities | Guarantor Subsidiary |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 400 | 5,100
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 | 9,721,600 | 8,058,400 |  |
Intercompany notes receivable | 1,528,000 | 3,703,100 |  |
Other assets | 0 | 0 |  |
Total investments and other assets | 11,249,600 | 11,761,500 |  |
Total assets | 11,249,600 | 11,761,500 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings |  | 0 |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Intercompany debt | 7,701,500 | 8,627,800 |  |
Long-term debt, excluding current maturities | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Other deferred credits | 0 | 0 |  |
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 | 3,548,100 | 3,133,700 |  |
Total liabilities and equity | 11,249,600 | 11,761,500 |  |
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 819,000 | 1,203,000 |  |
Materials and supplies | 141,200 | 90,300 |  |
Natural gas and natural gas liquids in storage | 296,700 | 342,300 |  |
Other current assets | 100,600 | 80,600 |  |
Total current assets | 1,357,500 | 1,716,200 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 17,885,500 | 15,431,300 |  |
Accumulated depreciation and amortization | 3,172,300 | 2,775,100 |  |
Net property, plant and equipment | 14,713,200 | 12,656,200 |  |
Investments and other assets |  |  |  |
Investments | 791,100 | 803,000 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 982,300 | 1,007,400 |  |
Total investments and other assets | 1,773,400 | 1,810,400 |  |
Total assets | 17,844,100 | 16,182,800 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 7,700 | 7,700 |  |
Short-term borrowings |  | 0 |  |
Accounts payable | 1,086,800 | 1,128,600 |  |
Other current liabilities | 278,400 | 328,400 |  |
Total current liabilities | 1,372,900 | 1,464,700 |  |
Intercompany debt | 6,836,600 | 6,630,000 |  |
Long-term debt, excluding current maturities | 21,200 | 28,800 |  |
Deferred income taxes | 108,400 | 97,100 |  |
Other deferred credits | 135,200 | 111,000 |  |
Deferred credits and other liabilities | 243,600 | 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 | 9,369,800 | 7,851,200 |  |
Total liabilities and equity | 17,844,100 | 16,182,800 |  |
Reportable Legal Entities | Total |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 12,000 | 37,200 | 248,900 | 97,600
Accounts receivable, net | 819,000 | 1,203,000 |  |
Materials and supplies | 141,200 | 90,300 |  |
Natural gas and natural gas liquids in storage | 296,700 | 342,300 |  |
Other current assets | 129,700 | 91,700 |  |
Total current assets | 1,398,600 | 1,764,500 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 18,031,000 | 15,559,600 |  |
Accumulated depreciation and amortization | 3,264,300 | 2,861,500 |  |
Net property, plant and equipment | 14,766,700 | 12,698,100 |  |
Investments and other assets |  |  |  |
Investments | 969,200 | 1,003,200 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 1,097,200 | 1,380,100 |  |
Total investments and other assets | 2,066,400 | 2,383,300 |  |
Total assets | 18,231,700 | 16,845,900 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 507,700 | 432,700 |  |
Short-term borrowings |  | 614,700 |  |
Accounts payable | 1,118,100 | 1,140,600 |  |
Other current liabilities | 482,600 | 479,300 |  |
Total current liabilities | 2,108,400 | 2,667,300 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 8,873,300 | 8,091,600 |  |
Deferred income taxes | 219,700 | 52,700 |  |
Other deferred credits | 450,800 | 348,900 |  |
Deferred credits and other liabilities | 670,500 | 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 | 6,579,500 | 5,685,400 |  |
Total liabilities and equity | 18,231,700 | 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 | (19,245,100) | (16,744,000) |  |
Intercompany notes receivable | (14,538,100) | (15,257,800) |  |
Other assets | (1,000) | (44,400) |  |
Total investments and other assets | (33,784,200) | (32,046,200) |  |
Total assets | (33,784,200) | (32,046,200) |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings |  | 0 |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Intercompany debt | (14,538,100) | (15,257,800) |  |
Long-term debt, excluding current maturities | 0 | 0 |  |
Deferred income taxes | (1,000) | (44,400) |  |
Other deferred credits | 0 | 0 |  |
Deferred credits and other liabilities | (1,000) | (44,400) |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries |  | (16,744,000) |  |
Noncontrolling interests in consolidated subsidiaries |  | 0 |  |
Total equity | (19,245,100) | (16,744,000) |  |
Total liabilities and equity | $ (33,784,200) | $ (32,046,200) |  |

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