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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)