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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)