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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION CONDENSED CONSOLIDATING FINANCIAL STATEMENTS, Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 20,958 | $ 11,975 | $ 37,193 | $ 248,875
Accounts receivable, net | 835,121 | 818,958 |  |
Materials and supplies | 201,749 | 141,174 |  |
Natural gas and NGLs in storage | 304,926 | 296,667 |  |
Other current assets | 82,313 | 100,808 |  |
Total current assets | 1,470,334 | 1,398,632 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 22,051,492 | 18,030,963 |  |
Accumulated depreciation and amortization | 3,702,807 | 3,264,312 |  |
Net property, plant and equipment | 18,348,685 | 14,766,651 |  |
Investments and other assets |  |  |  |
Investments | 861,844 | 969,150 | 1,003,156 |
Other assets | 173,425 | 130,096 |  |
Total investments and other assets | 1,993,102 | 2,066,388 |  |
Total assets | 21,812,121 | 18,231,671 | 16,845,937 |
Current liabilities |  |  |  |
Current maturities of long-term debt | 7,650 | 507,650 |  |
Short-term borrowings | 220,000 | 0 |  |
Accounts payable | 1,209,900 | 1,116,337 |  |
Other current liabilities | 285,569 | 211,110 |  |
Total current liabilities | 2,020,298 | 2,108,436 |  |
Long-term debt, excluding current maturities | 12,479,757 | 8,873,334 |  |
Deferred income taxes | 536,063 | 219,731 |  |
Other deferred credits | 525,756 | 424,383 |  |
Deferred credits and other liabilities | 1,086,115 | 670,358 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Equity excluding noncontrolling interests in consolidated subsidiaries | 6,225,951 | 6,579,543 |  |
Total equity | 6,225,951 | 6,579,543 | 5,685,352 | 3,428,915
Total liabilities and equity | 21,812,121 | 18,231,671 |  |
Reportable Legal Entities | Parent Issuer & Guarantor |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 21,000 | 12,000 | 37,200 | 248,500
Accounts receivable, net | 0 | 0 |  |
Materials and supplies | 0 | 0 |  |
Natural gas and NGLs in storage | 0 | 0 |  |
Other current assets | 12,400 | 29,100 |  |
Total current assets | 33,400 | 41,100 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 166,600 | 145,500 |  |
Accumulated depreciation and amortization | 99,500 | 92,000 |  |
Net property, plant and equipment | 67,100 | 53,500 |  |
Investments and other assets |  |  |  |
Investments | 6,732,600 | 6,153,500 |  |
Intercompany notes receivable | 8,950,900 | 5,308,600 |  |
Other assets | 139,900 | 115,900 |  |
Total investments and other assets | 15,823,400 | 11,578,000 |  |
Total assets | 15,923,900 | 11,672,600 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 0 |  |
Short-term borrowings | 220,000 |  |  |
Accounts payable | 23,800 | 31,300 |  |
Other current liabilities | 243,800 | 123,200 |  |
Total current liabilities | 487,600 | 154,500 |  |
Intercompany payables | 0 | 0 |  |
Long-term debt, excluding current maturities | 8,421,100 | 4,510,700 |  |
Deferred income taxes | 417,100 | 112,300 |  |
Other deferred credits | 372,100 | 315,600 |  |
Deferred credits and other liabilities | 789,200 | 427,900 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Total equity | 6,226,000 | 6,579,500 |  |
Total liabilities and equity | 15,923,900 | 11,672,600 |  |
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 NGLs 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 | 4,101,400 | 3,548,100 |  |
Intercompany notes receivable | 6,903,200 | 7,701,500 |  |
Other assets | 0 | 0 |  |
Total investments and other assets | 11,004,600 | 11,249,600 |  |
Total assets | 11,004,600 | 11,249,600 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 0 | 500,000 |  |
Short-term borrowings | 0 |  |  |
Accounts payable | 0 | 0 |  |
Other current liabilities | 63,300 | 81,000 |  |
Total current liabilities | 63,300 | 581,000 |  |
Intercompany payables | 0 | 0 |  |
Long-term debt, excluding current maturities | 4,045,100 | 4,341,400 |  |
Deferred income taxes | 0 | 0 |  |
Other deferred credits | 0 | 0 |  |
Deferred credits and other liabilities | 0 | 0 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Total equity | 6,896,200 | 6,327,200 |  |
Total liabilities and equity | 11,004,600 | 11,249,600 |  |
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 NGLs 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 | 11,466,300 | 9,721,600 |  |
Intercompany notes receivable | 0 | 1,528,000 |  |
Other assets | 0 | 0 |  |
Total investments and other assets | 11,466,300 | 11,249,600 |  |
Total assets | 11,466,300 | 11,249,600 |  |
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 payables | 7,364,900 | 7,701,500 |  |
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 |  |  |  |
Total equity | 4,101,400 | 3,548,100 |  |
Total liabilities and equity | 11,466,300 | 11,249,600 |  |
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | 835,100 | 819,000 |  |
Materials and supplies | 201,700 | 141,200 |  |
Natural gas and NGLs in storage | 304,900 | 296,700 |  |
Other current assets | 95,200 | 100,600 |  |
Total current assets | 1,436,900 | 1,357,500 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 21,884,900 | 17,885,500 |  |
Accumulated depreciation and amortization | 3,603,300 | 3,172,300 |  |
Net property, plant and equipment | 18,281,600 | 14,713,200 |  |
Investments and other assets |  |  |  |
Investments | 769,900 | 791,100 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 992,100 | 982,300 |  |
Total investments and other assets | 1,762,000 | 1,773,400 |  |
Total assets | 21,480,500 | 17,844,100 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 7,700 | 7,700 |  |
Short-term borrowings | 0 |  |  |
Accounts payable | 1,186,100 | 1,085,000 |  |
Other current liabilities | 275,600 | 280,200 |  |
Total current liabilities | 1,469,400 | 1,372,900 |  |
Intercompany payables | 8,489,200 | 6,836,600 |  |
Long-term debt, excluding current maturities | 13,500 | 21,200 |  |
Deferred income taxes | 119,700 | 108,400 |  |
Other deferred credits | 177,900 | 135,200 |  |
Deferred credits and other liabilities | 297,600 | 243,600 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Total equity | 11,210,800 | 9,369,800 |  |
Total liabilities and equity | 21,480,500 | 17,844,100 |  |
Reportable Legal Entities | Total |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 21,000 | 12,000 | 37,200 | 248,900
Accounts receivable, net | 835,100 | 819,000 |  |
Materials and supplies | 201,700 | 141,200 |  |
Natural gas and NGLs in storage | 304,900 | 296,700 |  |
Other current assets | 107,600 | 129,700 |  |
Total current assets | 1,470,300 | 1,398,600 |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | 22,051,500 | 18,031,000 |  |
Accumulated depreciation and amortization | 3,702,800 | 3,264,300 |  |
Net property, plant and equipment | 18,348,700 | 14,766,700 |  |
Investments and other assets |  |  |  |
Investments | 861,800 | 969,200 |  |
Intercompany notes receivable | 0 | 0 |  |
Other assets | 1,131,300 | 1,097,200 |  |
Total investments and other assets | 1,993,100 | 2,066,400 |  |
Total assets | 21,812,100 | 18,231,700 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 7,700 | 507,700 |  |
Short-term borrowings | 220,000 |  |  |
Accounts payable | 1,209,900 | 1,116,300 |  |
Other current liabilities | 582,700 | 484,400 |  |
Total current liabilities | 2,020,300 | 2,108,400 |  |
Intercompany payables | 0 | 0 |  |
Long-term debt, excluding current maturities | 12,479,700 | 8,873,300 |  |
Deferred income taxes | 536,100 | 219,700 |  |
Other deferred credits | 550,000 | 450,800 |  |
Deferred credits and other liabilities | 1,086,100 | 670,500 |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Total equity | 6,226,000 | 6,579,500 |  |
Total liabilities and equity | 21,812,100 | 18,231,700 |  |
Consolidating Entries and Other |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | $ 0 | $ 0
Accounts receivable, net | 0 | 0 |  |
Materials and supplies | 0 | 0 |  |
Natural gas and NGLs 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 | (22,208,400) | (19,245,100) |  |
Intercompany notes receivable | (15,854,100) | (14,538,100) |  |
Other assets | (700) | (1,000) |  |
Total investments and other assets | (38,063,200) | (33,784,200) |  |
Total assets | (38,063,200) | (33,784,200) |  |
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 payables | (15,854,100) | (14,538,100) |  |
Long-term debt, excluding current maturities | 0 | 0 |  |
Deferred income taxes | (700) | (1,000) |  |
Other deferred credits | 0 | 0 |  |
Deferred credits and other liabilities | (700) | (1,000) |  |
Commitments and contingencies |  |  |  |
Equity |  |  |  |
Total equity | (22,208,400) | (19,245,100) |  |
Total liabilities and equity | $ (38,063,200) | $ (33,784,200) |  |

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