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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 84,464	$ 37,193	$ 11,676	$ 248,875
Accounts receivable, net	1,085,075	1,202,951
Materials and supplies	128,574	90,301
Natural gas and natural gas liquids in storage	426,293	342,293
Other current assets	61,340	53,008
Total current assets	1,807,908	1,764,458
Property, plant and equipment
Property, plant and equipment	17,120,187	15,559,667
Accumulated depreciation and amortization	3,159,660	2,861,541
Net property, plant and equipment	13,960,527	12,698,126
Investments and other assets
Investments	981,592	1,003,156
Goodwill and intangible assets	970,117	993,460
Other assets	191,170	180,830
Total investments and other assets	2,142,879	2,383,353
Total assets	17,911,314	16,845,937	16,764,841
Current liabilities
Current maturities of long-term debt	507,650	432,650
Short-term borrowings	120,000	614,673
Accounts payable	1,339,507	1,140,571
Other current liabilities	208,312	179,971
Total current liabilities	2,450,206	2,667,335
Long-term debt, excluding current maturities	8,325,708	8,091,629
Deferred credits and other liabilities
Deferred income taxes	132,242	52,697
Other deferred credits	350,400	348,924
Total deferred credits and other liabilities	482,642	401,621
Commitments and contingencies
Equity
Equity excluding noncontrolling interests in consolidated subsidiaries	6,652,758	5,527,867
Noncontrolling interests in consolidated subsidiaries	0	157,485
Total equity	6,652,758	5,685,352	5,516,383	3,428,915
Total liabilities and equity	17,911,314	16,845,937
Reportable Legal Entities | Parent Issuer & Guarantor
Current assets
Cash and cash equivalents	84,500	37,200	11,700	248,500
Accounts receivable, net	0	0
Materials and supplies	0	0
Natural gas and natural gas liquids in storage	0	0
Other current assets	10,400	9,800
Total current assets	94,900	47,000
Property, plant and equipment
Property, plant and equipment	141,000	128,300
Accumulated depreciation and amortization	90,500	86,400
Net property, plant and equipment	50,500	41,900
Investments and other assets
Investments	5,977,500	5,752,100
Intercompany notes receivable	4,769,100	2,926,900
Other assets	174,300	416,900
Total investments and other assets	10,920,900	9,095,900
Total assets	11,066,300	9,184,800
Current liabilities
Current maturities of long-term debt	0	0
Short-term borrowings	120,000	614,700
Accounts payable	5,100	12,000
Other current liabilities	71,800	65,900
Total current liabilities	196,900	692,600
Intercompany debt	0	0
Long-term debt, excluding current maturities	3,962,200	2,726,400
Deferred credits and other liabilities
Deferred income taxes	25,800	0
Other deferred credits	228,600	237,900
Total deferred credits and other liabilities	254,400	237,900
Commitments and contingencies
Equity
Equity excluding noncontrolling interests in consolidated subsidiaries		5,527,900
Noncontrolling interests in consolidated subsidiaries		0
Total equity	6,652,800	5,527,900
Total liabilities and equity	11,066,300	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	3,359,000	3,133,700
Intercompany notes receivable	7,682,500	8,627,800
Other assets	0	200
Total investments and other assets	11,041,500	11,761,700
Total assets	11,041,500	11,763,000
Current liabilities
Current maturities of long-term debt	500,000	425,000
Short-term borrowings	0	0
Accounts payable	0	0
Other current liabilities	67,600	85,000
Total current liabilities	567,600	510,000
Intercompany debt	0	0
Long-term debt, excluding current maturities	4,340,400	5,336,400
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 excluding noncontrolling interests in consolidated subsidiaries		5,916,600
Noncontrolling interests in consolidated subsidiaries		0
Total equity	6,133,500	5,916,600
Total liabilities and equity	11,041,500	11,763,000
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 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	9,223,200	8,058,400
Intercompany notes receivable	1,818,300	3,703,100
Other assets	0	0
Total investments and other assets	11,041,500	11,761,500
Total assets	11,041,500	11,761,500
Current liabilities
Current maturities of long-term debt	0	0
Short-term borrowings	0	0
Accounts payable	0	0
Other current liabilities	0	0
Total current liabilities	0	0
Intercompany debt	7,682,500	8,627,800
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 excluding noncontrolling interests in consolidated subsidiaries		3,133,700
Noncontrolling interests in consolidated subsidiaries		0
Total equity	3,359,000	3,133,700
Total liabilities and equity	11,041,500	11,761,500
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	1,085,100	1,203,000
Materials and supplies	128,600	90,300
Natural gas and natural gas liquids in storage	426,300	342,300
Other current assets	73,000	80,600
Total current assets	1,713,000	1,716,200
Property, plant and equipment
Property, plant and equipment	16,979,200	15,431,300
Accumulated depreciation and amortization	3,069,200	2,775,100
Net property, plant and equipment	13,910,000	12,656,200
Investments and other assets
Investments	796,800	803,000
Intercompany notes receivable	0	0
Other assets	988,200	1,007,400
Total investments and other assets	1,785,000	1,810,400
Total assets	17,408,000	16,182,800
Current liabilities
Current maturities of long-term debt	7,700	7,700
Short-term borrowings	0	0
Accounts payable	1,334,400	1,128,600
Other current liabilities	343,600	328,400
Total current liabilities	1,685,700	1,464,700
Intercompany debt	6,587,400	6,630,000
Long-term debt, excluding current maturities	23,100	28,800
Deferred credits and other liabilities
Deferred income taxes	107,600	97,100
Other deferred credits	121,800	111,000
Total deferred credits and other liabilities	229,400	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	8,882,400	7,851,200
Total liabilities and equity	17,408,000	16,182,800
Reportable Legal Entities | Total
Current assets
Cash and cash equivalents	84,500	37,200	11,700	248,900
Accounts receivable, net	1,085,100	1,203,000
Materials and supplies	128,600	90,300
Natural gas and natural gas liquids in storage	426,300	342,300
Other current assets	83,400	91,700
Total current assets	1,807,900	1,764,500
Property, plant and equipment
Property, plant and equipment	17,120,200	15,559,600
Accumulated depreciation and amortization	3,159,700	2,861,500
Net property, plant and equipment	13,960,500	12,698,100
Investments and other assets
Investments	981,600	1,003,200
Intercompany notes receivable	0	0
Other assets	1,161,300	1,380,100
Total investments and other assets	2,142,900	2,383,300
Total assets	17,911,300	16,845,900
Current liabilities
Current maturities of long-term debt	507,700	432,700
Short-term borrowings	120,000	614,700
Accounts payable	1,339,500	1,140,600
Other current liabilities	483,000	479,300
Total current liabilities	2,450,200	2,667,300
Intercompany debt	0	0
Long-term debt, excluding current maturities	8,325,700	8,091,600
Deferred credits and other liabilities
Deferred income taxes	132,200	52,700
Other deferred credits	350,400	348,900
Total deferred credits and other liabilities	482,600	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	6,652,800	5,685,400
Total liabilities and equity	17,911,300	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	(18,374,900)	(16,744,000)
Intercompany notes receivable	(14,269,900)	(15,257,800)
Other assets	(1,200)	(44,400)
Total investments and other assets	(32,646,000)	(32,046,200)
Total assets	(32,646,000)	(32,046,200)
Current liabilities
Current maturities of long-term debt	0	0
Short-term borrowings	0	0
Accounts payable	0	0
Other current liabilities	0	0
Total current liabilities	0	0
Intercompany debt	(14,269,900)	(15,257,800)
Long-term debt, excluding current maturities	0	0
Deferred credits and other liabilities
Deferred income taxes	(1,200)	(44,400)
Other deferred credits	0	0
Total deferred credits and other liabilities	(1,200)	(44,400)
Commitments and contingencies
Equity
Equity excluding noncontrolling interests in consolidated subsidiaries		(16,744,000)
Noncontrolling interests in consolidated subsidiaries		0
Total equity	(18,374,900)	(16,744,000)
Total liabilities and equity	$ (32,646,000)	$ (32,046,200)

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