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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Current assets          
Cash and cash equivalents $ 673,309 $ 11,975 $ 84,464   $ 37,193
Accounts receivable, net 718,708 818,958      
Materials and supplies 192,933 141,174      
Natural gas and NGLs in storage 283,545 296,667      
Other current assets 79,763 100,808      
Total current assets 1,967,585 1,398,632      
Property, plant and equipment          
Property, plant and equipment 20,948,267 18,030,963      
Accumulated depreciation and amortization 3,585,411 3,264,312      
Net property, plant and equipment 17,362,856 14,766,651      
Investments and other assets          
Investments 870,511 969,150      
Other assets 174,147 130,096      
Total investments and other assets 2,005,466 2,066,388      
Total assets 21,335,907 18,231,671 17,911,314    
Current liabilities          
Current maturities of long-term debt 7,650 507,650      
Accounts payable 1,129,849 1,116,337      
Other current liabilities 123,146 149,773      
Total current liabilities 1,567,152 2,108,436      
Long-term debt, excluding current maturities 12,479,452 8,873,334      
Deferred credits and other liabilities          
Deferred income taxes 418,736 219,731      
Other deferred credits 626,860 424,383      
Total deferred credits and other liabilities 1,070,397 670,358      
Commitments and contingencies      
Equity          
Equity 6,218,906 6,579,543 6,652,758 $ 6,838,483  
Total liabilities and equity 21,335,907 18,231,671      
Reportable Legal Entities | Parent Issuer & Guarantor          
Current assets          
Cash and cash equivalents 673,300 12,000 84,500   37,200
Accounts receivable, net 0 0      
Materials and supplies 0 0      
Natural gas and NGLs in storage 0 0      
Other current assets 12,300 29,100      
Total current assets 685,600 41,100      
Property, plant and equipment          
Property, plant and equipment 160,000 145,500      
Accumulated depreciation and amortization 97,600 92,000      
Net property, plant and equipment 62,400 53,500      
Investments and other assets          
Investments 6,554,500 6,153,500      
Intercompany receivable 8,099,100 5,308,600      
Other assets 134,800 115,900      
Total investments and other assets 14,788,400 11,578,000      
Total assets 15,536,400 11,672,600      
Current liabilities          
Current maturities of long-term debt 0 0      
Accounts payable 9,500 31,300      
Other current liabilities 96,400 123,200      
Total current liabilities 105,900 154,500      
Intercompany payable 0 0      
Long-term debt, excluding current maturities 8,419,600 4,510,700      
Deferred credits and other liabilities          
Deferred income taxes 297,900 112,300      
Other deferred credits 494,100 315,600      
Total deferred credits and other liabilities 792,000 427,900      
Commitments and contingencies      
Equity          
Equity 6,218,900 6,579,500      
Total liabilities and equity 15,536,400 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 3,932,200 3,548,100      
Intercompany receivable 6,897,700 7,701,500      
Other assets 0 0      
Total investments and other assets 10,829,900 11,249,600      
Total assets 10,829,900 11,249,600      
Current liabilities          
Current maturities of long-term debt 0 500,000      
Accounts payable 0 0      
Other current liabilities 63,500 81,000      
Total current liabilities 63,500 581,000      
Intercompany payable 0 0      
Long-term debt, excluding current maturities 4,044,300 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 6,722,100 6,327,200      
Total liabilities and equity 10,829,900 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 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 10,986,900 9,721,600      
Intercompany receivable 0 1,528,000      
Other assets 0 0      
Total investments and other assets 10,986,900 11,249,600      
Total assets 10,986,900 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 payable 7,054,700 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 3,932,200 3,548,100      
Total liabilities and equity 10,986,900 11,249,600      
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries          
Current assets          
Cash and cash equivalents 0 0 0   0
Accounts receivable, net 718,700 819,000      
Materials and supplies 192,900 141,200      
Natural gas and NGLs in storage 283,500 296,700      
Other current assets 86,800 100,600      
Total current assets 1,281,900 1,357,500      
Property, plant and equipment          
Property, plant and equipment 20,788,300 17,885,500      
Accumulated depreciation and amortization 3,487,800 3,172,300      
Net property, plant and equipment 17,300,500 14,713,200      
Investments and other assets          
Investments 770,600 791,100      
Intercompany receivable 0 0      
Other assets 1,001,100 982,300      
Total investments and other assets 1,771,700 1,773,400      
Total assets 20,354,100 17,844,100      
Current liabilities          
Current maturities of long-term debt 7,700 7,700      
Accounts payable 1,120,300 1,085,000      
Other current liabilities 269,700 280,200      
Total current liabilities 1,397,700 1,372,900      
Intercompany payable 7,942,100 6,836,600      
Long-term debt, excluding current maturities 15,600 21,200      
Deferred credits and other liabilities          
Deferred income taxes 121,700 108,400      
Other deferred credits 157,600 135,200      
Total deferred credits and other liabilities 279,300 243,600      
Commitments and contingencies      
Equity          
Equity 10,719,400 9,369,800      
Total liabilities and equity 20,354,100 17,844,100      
Reportable Legal Entities | Total          
Current assets          
Cash and cash equivalents 673,300 12,000 84,500   37,200
Accounts receivable, net 718,700 819,000      
Materials and supplies 192,900 141,200      
Natural gas and NGLs in storage 283,500 296,700      
Other current assets 99,100 129,700      
Total current assets 1,967,500 1,398,600      
Property, plant and equipment          
Property, plant and equipment 20,948,300 18,031,000      
Accumulated depreciation and amortization 3,585,400 3,264,300      
Net property, plant and equipment 17,362,900 14,766,700      
Investments and other assets          
Investments 870,500 969,200      
Intercompany receivable 0 0      
Other assets 1,135,000 1,097,200      
Total investments and other assets 2,005,500 2,066,400      
Total assets 21,335,900 18,231,700      
Current liabilities          
Current maturities of long-term debt 7,700 507,700      
Accounts payable 1,129,800 1,116,300      
Other current liabilities 429,600 484,400      
Total current liabilities 1,567,100 2,108,400      
Intercompany payable 0 0      
Long-term debt, excluding current maturities 12,479,500 8,873,300      
Deferred credits and other liabilities          
Deferred income taxes 418,700 219,700      
Other deferred credits 651,700 450,800      
Total deferred credits and other liabilities 1,070,400 670,500      
Commitments and contingencies      
Equity          
Equity 6,218,900 6,579,500      
Total liabilities and equity 21,335,900 18,231,700      
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 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 (21,373,700) (19,245,100)      
Intercompany receivable (14,996,800) (14,538,100)      
Other assets (900) (1,000)      
Total investments and other assets (36,371,400) (33,784,200)      
Total assets (36,371,400) (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 payable (14,996,800) (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 (21,373,700) (19,245,100)      
Total liabilities and equity $ (36,371,400) $ (33,784,200)