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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Current assets          
Cash and cash equivalents $ 273,397   $ 11,975 $ 15,295 $ 37,193
Accounts receivable, net 669,289   818,958    
Materials and supplies 177,517   141,174    
Natural gas and NGLs in storage 184,950   296,667    
Other current assets 69,596   100,808    
Total current assets 1,401,170   1,398,632    
Property, plant and equipment          
Property, plant and equipment 19,806,759   18,030,963    
Accumulated depreciation and amortization 3,470,520   3,264,312    
Net property, plant and equipment 16,336,239   14,766,651    
Investments and other assets          
Investments 881,084   969,150    
Other assets 169,318   130,096    
Total investments and other assets 2,014,185   2,066,388    
Total assets 19,751,594   18,231,671 16,913,720  
Current liabilities          
Current maturities of long-term debt 307,650   507,650    
Accounts payable 907,377   1,116,337    
Other current liabilities 252,991   211,110    
Total current liabilities 1,737,373   2,108,436    
Long-term debt, excluding current maturities 10,754,087   8,873,334    
Deferred credits and other liabilities          
Deferred income taxes 347,831   219,731    
Other deferred credits 538,873   424,383    
Total deferred credits and other liabilities 911,998   670,358    
Commitments and contingencies      
Equity          
Equity 6,348,136 $ 6,442,006 6,579,543 6,838,483  
Total liabilities and equity 19,751,594   18,231,671    
Reportable Legal Entities | Parent Issuer & Guarantor          
Current assets          
Cash and cash equivalents 273,400   12,000 15,300 37,200
Accounts receivable, net 0   0    
Materials and supplies     0    
Natural gas and NGLs in storage 0   0    
Other current assets 13,400   29,100    
Total current assets 286,800   41,100    
Property, plant and equipment          
Property, plant and equipment 153,400   145,500    
Accumulated depreciation and amortization 95,700   92,000    
Net property, plant and equipment 57,700   53,500    
Investments and other assets          
Investments 6,403,000   6,153,500    
Intercompany notes receivable 7,010,100   5,308,600    
Other assets 132,300   115,900    
Total investments and other assets 13,545,400   11,578,000    
Total assets 13,889,900   11,672,600    
Current liabilities          
Current maturities of long-term debt 0   0    
Accounts payable 7,400   31,300    
Other current liabilities 205,000   123,200    
Total current liabilities 212,400   154,500    
Intercompany debt 0   0    
Long-term debt, excluding current maturities 6,693,500   4,510,700    
Deferred credits and other liabilities          
Deferred income taxes 231,100   112,300    
Other deferred credits 404,800   315,600    
Total deferred credits and other liabilities 635,900   427,900    
Commitments and contingencies      
Equity          
Equity 6,348,100   6,579,500    
Total liabilities and equity 13,889,900   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    
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 3,781,200   3,548,100    
Intercompany notes receivable 7,197,800   7,701,500    
Other assets 0   0    
Total investments and other assets 10,979,000   11,249,600    
Total assets 10,979,000   11,249,600    
Current liabilities          
Current maturities of long-term debt 300,000   500,000    
Accounts payable 0   0    
Other current liabilities 66,600   81,000    
Total current liabilities 366,600   581,000    
Intercompany debt 0   0    
Long-term debt, excluding current maturities 4,043,200   4,341,400    
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 6,569,200   6,327,200    
Total liabilities and equity 10,979,000   11,249,600    
Reportable Legal Entities | Guarantor Subsidiary          
Current assets          
Cash and cash equivalents 0   0 0 0
Accounts receivable, net 0   0    
Materials and supplies     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 10,523,200   9,721,600    
Intercompany notes receivable 455,800   1,528,000    
Other assets 0   0    
Total investments and other assets 10,979,000   11,249,600    
Total assets 10,979,000   11,249,600    
Current liabilities          
Current maturities of long-term debt 0   0    
Accounts payable 0   0    
Other current liabilities 0   0    
Total current liabilities 0   0    
Intercompany debt 7,197,800   7,701,500    
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 3,781,200   3,548,100    
Total liabilities and equity 10,979,000   11,249,600    
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries          
Current assets          
Cash and cash equivalents 0   0 0 0
Accounts receivable, net 669,300   819,000    
Materials and supplies     141,200    
Natural gas and NGLs in storage 185,000   296,700    
Other current assets 260,100   100,600    
Total current assets 1,114,400   1,357,500    
Property, plant and equipment          
Property, plant and equipment 19,653,400   17,885,500    
Accumulated depreciation and amortization 3,374,900   3,172,300    
Net property, plant and equipment 16,278,500   14,713,200    
Investments and other assets          
Investments 774,000   791,100    
Intercompany notes receivable 0   0    
Other assets 1,001,700   982,300    
Total investments and other assets 1,775,700   1,773,400    
Total assets 19,168,600   17,844,100    
Current liabilities          
Current maturities of long-term debt 7,700   7,700    
Accounts payable 900,000   1,085,000    
Other current liabilities 250,700   280,200    
Total current liabilities 1,158,400   1,372,900    
Intercompany debt 7,465,900   6,836,600    
Long-term debt, excluding current maturities 17,400   21,200    
Deferred credits and other liabilities          
Deferred income taxes 117,600   108,400    
Other deferred credits 159,400   135,200    
Total deferred credits and other liabilities 277,000   243,600    
Commitments and contingencies      
Equity          
Equity 10,249,900   9,369,800    
Total liabilities and equity 19,168,600   17,844,100    
Reportable Legal Entities | Total          
Current assets          
Cash and cash equivalents 273,400   12,000 15,300 37,200
Accounts receivable, net 669,300   819,000    
Materials and supplies     141,200    
Natural gas and NGLs in storage 185,000   296,700    
Other current assets 273,500   129,700    
Total current assets 1,401,200   1,398,600    
Property, plant and equipment          
Property, plant and equipment 19,806,800   18,031,000    
Accumulated depreciation and amortization 3,470,600   3,264,300    
Net property, plant and equipment 16,336,200   14,766,700    
Investments and other assets          
Investments 881,100   969,200    
Intercompany notes receivable 0   0    
Other assets 1,133,100   1,097,200    
Total investments and other assets 2,014,200   2,066,400    
Total assets 19,751,600   18,231,700    
Current liabilities          
Current maturities of long-term debt 307,700   507,700    
Accounts payable 907,400   1,116,300    
Other current liabilities 522,300   484,400    
Total current liabilities 1,737,400   2,108,400    
Intercompany debt 0   0    
Long-term debt, excluding current maturities 10,754,100   8,873,300    
Deferred credits and other liabilities          
Deferred income taxes 347,800   219,700    
Other deferred credits 564,200   450,800    
Total deferred credits and other liabilities 912,000   670,500    
Commitments and contingencies      
Equity          
Equity 6,348,100   6,579,500    
Total liabilities and equity 19,751,600   18,231,700    
Consolidating Entries          
Current assets          
Cash and cash equivalents 0   0 $ 0 $ 0
Accounts receivable, net 0   0    
Materials and supplies     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 (20,600,300)   (19,245,100)    
Intercompany notes receivable (14,663,700)   (14,538,100)    
Other assets (900)   (1,000)    
Total investments and other assets (35,264,900)   (33,784,200)    
Total assets (35,264,900)   (33,784,200)    
Current liabilities          
Current maturities of long-term debt 0   0    
Accounts payable 0   0    
Other current liabilities 0   0    
Total current liabilities 0   0    
Intercompany debt (14,663,700)   (14,538,100)    
Long-term debt, excluding current maturities 0   0    
Deferred credits and other liabilities          
Deferred income taxes (900)   (1,000)    
Other deferred credits 0   0    
Total deferred credits and other liabilities (900)   (1,000)    
Commitments and contingencies      
Equity          
Equity (20,600,300)   (19,245,100)    
Total liabilities and equity $ (35,264,900)   $ (33,784,200)