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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 15,295 | $ 37,193 | $ 332,371 | $ 248,875
Accounts receivable, net | 934,664 | 1,202,951 |  |
Materials and supplies | 113,831 | 90,301 |  |
Natural gas and natural gas liquids in storage | 285,776 | 342,293 |  |
Other current assets | 57,286 | 53,008 |  |
Total current assets | 1,433,687 | 1,764,458 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 16,363,716 | 15,559,667 |  |
Accumulated depreciation and amortization | 3,059,799 | 2,861,541 |  |
Net property, plant and equipment | 13,303,917 | 12,698,126 |  |
Investments and other assets |  |  |  |
Investments | 986,979 | 1,003,156 |  |
Other assets | 170,124 | 180,830 |  |
Total investments and other assets | 2,176,116 | 2,383,353 |  |
Total assets | 16,913,720 | 16,845,937 | 16,672,923 |
Current liabilities |  |  |  |
Current maturities of long-term debt | 932,650 | 432,650 |  |
Short-term borrowings | 156,000 | 614,673 |  |
Accounts payable | 1,027,467 | 1,140,571 |  |
Other current liabilities | 184,127 | 179,971 |  |
Total current liabilities | 2,572,081 | 2,667,335 |  |
Long-term debt, excluding current maturities | 7,091,246 | 8,091,629 |  |
Deferred credits and other liabilities | 411,910 | 401,621 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 6,664,860 | 5,527,867 |  |
Noncontrolling interests in consolidated subsidiaries | 173,623 | 157,485 |  |
Total equity | 6,838,483 | 5,685,352 | 5,565,231 | 3,428,915
Total liabilities and equity | 16,913,720 | 16,845,937 |  |
Reportable Legal Entities | Parent Issuer & Guarantor |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 15,300 | 37,200 | 321,000 | 248,500
Accounts receivable, net | 0 | 0 |  |
Materials and supplies |  | 0 |  |
Natural gas and natural gas liquids in storage | 0 | 0 |  |
Other current assets | 11,900 | 9,800 |  |
Total current assets | 27,200 | 47,000 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 137,200 | 128,300 |  |
Accumulated depreciation and amortization | 89,200 | 86,400 |  |
Net property, plant and equipment | 48,000 | 41,900 |  |
Investments and other assets |  |  |  |
Investments | 5,872,900 | 5,752,100 |  |
Intercompany notes receivable | 3,679,200 | 2,926,900 |  |
Other assets | 233,000 | 416,900 |  |
Total investments and other assets | 9,785,100 | 9,095,900 |  |
Total assets | 9,860,300 | 9,184,800 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings | 156,000 | 614,700 |  |
Accounts payable | 6,200 | 12,000 |  |
Other current liabilities | 71,200 | 65,900 |  |
Total current liabilities | 233,400 | 692,600 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 2,727,000 | 2,726,400 |  |
Deferred credits and other liabilities | 235,000 | 237,900 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 6,664,900 | 5,527,900 |  |
Noncontrolling interests in consolidated subsidiaries | 0 | 0 |  |
Total equity | 6,664,900 | 5,527,900 |  |
Total liabilities and equity | 9,860,300 | 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 |  |
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 | 3,243,000 | 3,133,700 |  |
Intercompany notes receivable | 8,140,900 | 8,627,800 |  |
Other assets | 0 | 200 |  |
Total investments and other assets | 11,383,900 | 11,761,700 |  |
Total assets | 11,383,900 | 11,763,000 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 925,000 | 425,000 |  |
Short-term borrowings | 0 | 0 |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 85,000 | 85,000 |  |
Total current liabilities | 1,010,000 | 510,000 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 4,339,200 | 5,336,400 |  |
Deferred credits and other liabilities | 0 | 0 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 6,034,700 | 5,916,600 |  |
Noncontrolling interests in consolidated subsidiaries | 0 | 0 |  |
Total equity | 6,034,700 | 5,916,600 |  |
Total liabilities and equity | 11,383,900 | 11,763,000 |  |
Reportable Legal Entities | Guarantor Subsidiary |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 11,400 | 400
Accounts receivable, net | 0 | 0 |  |
Materials and supplies |  | 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 | 8,795,000 | 8,058,400 |  |
Intercompany notes receivable | 2,588,900 | 3,703,100 |  |
Other assets | 0 | 0 |  |
Total investments and other assets | 11,383,900 | 11,761,500 |  |
Total assets | 11,383,900 | 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 | 8,140,900 | 8,627,800 |  |
Long-term debt, excluding current maturities | 0 | 0 |  |
Deferred credits and other liabilities | 0 | 0 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 3,243,000 | 3,133,700 |  |
Noncontrolling interests in consolidated subsidiaries | 0 | 0 |  |
Total equity | 3,243,000 | 3,133,700 |  |
Total liabilities and equity | 11,383,900 | 11,761,500 |  |
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 934,700 | 1,203,000 |  |
Materials and supplies |  | 90,300 |  |
Natural gas and natural gas liquids in storage | 285,800 | 342,300 |  |
Other current assets | 186,000 | 80,600 |  |
Total current assets | 1,406,500 | 1,716,200 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 16,226,500 | 15,431,300 |  |
Accumulated depreciation and amortization | 2,970,600 | 2,775,100 |  |
Net property, plant and equipment | 13,255,900 | 12,656,200 |  |
Investments and other assets |  |  |  |
Investments | 795,400 | 803,000 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 1,006,900 | 1,007,400 |  |
Total investments and other assets | 1,802,300 | 1,810,400 |  |
Total assets | 16,464,700 | 16,182,800 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 7,700 | 7,700 |  |
Short-term borrowings | 0 | 0 |  |
Accounts payable | 1,021,300 | 1,128,600 |  |
Other current liabilities | 299,700 | 328,400 |  |
Total current liabilities | 1,328,700 | 1,464,700 |  |
Intercompany debt | 6,268,100 | 6,630,000 |  |
Long-term debt, excluding current maturities | 25,000 | 28,800 |  |
Deferred credits and other liabilities | 227,700 | 208,100 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 8,441,600 | 7,693,700 |  |
Noncontrolling interests in consolidated subsidiaries | 173,600 | 157,500 |  |
Total equity | 8,615,200 | 7,851,200 |  |
Total liabilities and equity | 16,464,700 | 16,182,800 |  |
Reportable Legal Entities | Total |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 15,300 | 37,200 | 332,400 | 248,900
Accounts receivable, net | 934,700 | 1,203,000 |  |
Materials and supplies |  | 90,300 |  |
Natural gas and natural gas liquids in storage | 285,800 | 342,300 |  |
Other current assets | 197,900 | 91,700 |  |
Total current assets | 1,433,700 | 1,764,500 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 16,363,700 | 15,559,600 |  |
Accumulated depreciation and amortization | 3,059,800 | 2,861,500 |  |
Net property, plant and equipment | 13,303,900 | 12,698,100 |  |
Investments and other assets |  |  |  |
Investments | 987,000 | 1,003,200 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 1,189,100 | 1,380,100 |  |
Total investments and other assets | 2,176,100 | 2,383,300 |  |
Total assets | 16,913,700 | 16,845,900 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 932,700 | 432,700 |  |
Short-term borrowings | 156,000 | 614,700 |  |
Accounts payable | 1,027,500 | 1,140,600 |  |
Other current liabilities | 455,900 | 479,300 |  |
Total current liabilities | 2,572,100 | 2,667,300 |  |
Intercompany debt | 0 | 0 |  |
Long-term debt, excluding current maturities | 7,091,200 | 8,091,600 |  |
Deferred credits and other liabilities | 411,900 | 401,600 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 6,664,900 | 5,527,900 |  |
Noncontrolling interests in consolidated subsidiaries | 173,600 | 157,500 |  |
Total equity | 6,838,500 | 5,685,400 |  |
Total liabilities and equity | 16,913,700 | 16,845,900 |  |
Consolidating Entries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Accounts receivable, net | 0 | 0 |  |
Materials and supplies |  | 0 |  |
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 | (17,719,300) | (16,744,000) |  |
Intercompany notes receivable | (14,409,000) | (15,257,800) |  |
Other assets | (50,800) | (44,400) |  |
Total investments and other assets | (32,179,100) | (32,046,200) |  |
Total assets | (32,179,100) | (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 | (14,409,000) | (15,257,800) |  |
Long-term debt, excluding current maturities | 0 | 0 |  |
Deferred credits and other liabilities | (50,800) | (44,400) |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | (17,719,300) | (16,744,000) |  |
Noncontrolling interests in consolidated subsidiaries | 0 | 0 |  |
Total equity | (17,719,300) | (16,744,000) |  |
Total liabilities and equity | $ (32,179,100) | $ (32,046,200) |  |

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