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General, Description of Business, and Basis of Presentation (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Aug. 10, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Apr. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Operating Lease, Liability		$ 228		$ 228
Operating Costs and Expenses		387	$ 388	727	$ 745
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net		141	(2)	141	(4)
Other Nonoperating Income (Expense)		7	26	18	47
Operating Income (Loss)		(498)	(410)	(1,059)	(901)
Net Cash Provided by (Used in) Operating Activities				1,844	1,585
Net Cash Provided by (Used in) Investing Activities				1,424	1,669
Additional Paid in Capital, Common Stock		24,296		24,296				$ 24,693
Other Assets, Noncurrent		966		966				746
Accumulated Other Comprehensive Income (Loss), Net of Tax		265		265				270
Stockholders' Equity Attributable to Noncontrolling Interest		(3,233)		(3,233)				(1,337)
Deferred Tax Liabilities, Net, Noncurrent		(1,567)		(1,567)				(1,524)
Operating Lease, Right-of-Use Asset		221		221
Common Stock
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net		0	0	0	0
Capital in excess of par value [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net		(425)	6	(425)	13
AOCI
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net		0	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax		265		265				$ 270
Noncontrolling Interest [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net		$ 566	$ (8)	$ 566	$ (17)
Dividend Reinvestment Program [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Sale of Stock, Number of Shares Issued in Transaction					1,230,657
Sale of Stock, Consideration Received on Transaction					$ 46
Accounting Standards Update 2016-02 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Operating Lease, Liability							$ 225
Operating Lease, Right-of-Use Asset							$ 225
WPZ Merger Agreement [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited Partners' Capital Account, Units Outstanding	256,000,000
Increase (Decrease) in Other Noncurrent Assets	$ 33
Increase (Decrease) in Deferred Income Taxes	$ (1,829)
Stock Issued During Period, Shares, New Issues	382,000,000
WPZ Merger Agreement [Member] \| Common Stock
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	$ 382
WPZ Merger Agreement [Member] \| Capital in excess of par value [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	6,112
WPZ Merger Agreement [Member] \| AOCI
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	(3)
WPZ Merger Agreement [Member] \| Noncontrolling Interest [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net	$ (4,629)
Northeast G And P [Member] \| Cardinal Gas Services LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage				66.00%
Northeast G And P [Member] \| Appalachia Midstream Services, LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest				66.00%
Northeast G And P [Member] \| Ohio Valley Midstream LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage				65.00%
Atlantic Gulf [Member] \| Constitution Pipeline Company LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage				41.00%
Atlantic Gulf [Member] \| Gulfstar One [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Variable Interest Entity Ownership Percentage				51.00%
Conway Fractionator [Member] \| West [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest				50.00%
Gulfstream Natural Gas System, L.L.C.[Member] \| Atlantic Gulf [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%		50.00%
Utica East Ohio Midstream, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage								62.00%
Laurel Mountain Midstream, LLC [Member] \| Northeast G And P [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		69.00%		69.00%
Caiman Energy II [Member] \| Northeast G And P [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		58.00%		58.00%
Discovery Producer Services LLC [Member] \| Atlantic Gulf [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		60.00%		60.00%
Overland Pass Pipeline Company LLC [Member] \| West [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%		50.00%
Jackalope Gas Gathering Services LLC [Member] \| West [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage						50.00%
Rocky Mountain Midstream Holdings LLC [Member] \| West [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%		50.00%
Brazos Permian II LLC [Member] \| West [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		15.00%		15.00%