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General, Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions					1 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 10, 2018	Feb. 10, 2017	Feb. 01, 2017	Jan. 09, 2017	Feb. 03, 2017	Jan. 31, 2017	Jun. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Jan. 01, 2018	Mar. 31, 2017
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Regulatory Charges In Operating Expense Resulting From Tax Reform									$ (17)	$ 674	$ 0
Service revenues									8,604
Operating and maintenance expenses									1,507	1,576	1,592
Selling, General and Administrative Expense									569	594	722
Operating Income (Loss)									768	927	689
Other income (expense) - net below Operating income (loss)									92	(25)	85
Basis Of Presentation [Abstract]
Changes in ownership of consolidated subsidiaries, net									(4)	(910)	(6)
Net Cash Provided (Used) by Operating Activities									3,293	3,089	4,155
Net Cash Provided (Used) by Investing Activities									2,725	(100)	891
Stock Issued During Period, Shares, New Issues			9,750			65,000
Stock Issued During Period, Value, New Issues									35	2,118
Additional Paid in Capital, Common Stock									24,693	18,508
Other Assets, Noncurrent									746	619
Accumulated Other Comprehensive Income (Loss), Net of Tax									270	238
Stockholders' Equity Attributable to Noncontrolling Interest									(1,337)	(6,519)
Deferred Tax Liabilities, Net, Noncurrent									(1,524)	(3,147)
Regulatory Liabilities									1,326	1,268
Financial Repositioning [Member]
Basis Of Presentation [Abstract]
Sale Of Stock Number Of Shares Issued In Transaction				277	59,000	289,000
Payments to Acquire Limited Partnership Interests		$ 56		$ 10
Sale of Stock, Price Per Share					$ 36.08586
Dividend Reinvestment Program [Member]
Basis Of Presentation [Abstract]
Sale of Stock, Consideration Received on Transaction							$ 46			61	10
Noncontrolling Interest [Member]
Basis Of Presentation [Abstract]
Changes in ownership of consolidated subsidiaries, net									(18)	(2,407)	(18)
Stock Issued During Period, Value, New Issues									0	0
Capital in excess of par value [Member]
Basis Of Presentation [Abstract]
Changes in ownership of consolidated subsidiaries, net									14	1,497	$ 12
Stock Issued During Period, Value, New Issues									$ 0	$ 2,043
Gulfstream Natural Gas System, L.L.C.[Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%
Utica East Ohio Midstream, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									62.00%
Laurel Mountain Midstream, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									69.00%
Caiman Energy II [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									58.00%
Discovery Producer Services LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									60.00%
Overland Pass Pipeline Company LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%
Jackalope Gas Gathering Services LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%
Rocky Mountain Midstream Holdings LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%			40.00%
Brazos Permian II, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									15.00%
Williams Partners L.P. [Member] \| Financial Repositioning [Member]
Basis Of Presentation [Abstract]
Master limited partnership, general partner ownership percentage						2.00%
Northeast G And P [Member] \| Utica East Ohio Midstream, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									62.00%
Northeast G And P [Member] \| Laurel Mountain Midstream, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									69.00%
Northeast G And P [Member] \| Caiman Energy II [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									58.00%
Northeast G And P [Member] \| Appalachia Midstream Services, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									66.00%
Northeast G And P [Member] \| Cardinal Gas Services LLC [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage									66.00%
Northeast G And P [Member] \| Appalachia Midstream Services, LLC [Member]
General and Description Of Business [Abstract]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest									66.00%
Atlantic Gulf [Member] \| Gulfstream Natural Gas System, L.L.C.[Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%
Atlantic Gulf [Member] \| Discovery Producer Services LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									60.00%
Atlantic Gulf [Member] \| Gulfstar One [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage									51.00%
Atlantic Gulf [Member] \| Constitution Pipeline Company LLC [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage									41.00%
West [Member] \| Delaware Basin Gas Gathering System [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage														50.00%
West [Member] \| Overland Pass Pipeline Company LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%
West [Member] \| Jackalope Gas Gathering Services LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%
West [Member] \| Rocky Mountain Midstream Holdings LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									50.00%
West [Member] \| Brazos Permian II, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage									15.00%
Accounting Standards Update 2014-09 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets													$ (121)
Accounting Standards Update 2014-09 [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Operating and maintenance expenses									$ 1
Operating Income (Loss)									(120)
Basis Of Presentation [Abstract]
Other Assets, Noncurrent									(4)
Stockholders' Equity Attributable to Noncontrolling Interest									(28)
Deferred Tax Liabilities, Net, Noncurrent									$ (20)
Conway Fractionator [Member] \| West [Member]
General and Description Of Business [Abstract]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest									50.00%
Geismar [Member] \| Corporate and Other [Member]
General and Description Of Business [Abstract]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest								88.50%
WPZ Merger Agreement [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited Partners' Capital Account, Units Outstanding	256,000
Basis Of Presentation [Abstract]
Stock Issued During Period, Shares, New Issues	382,000
Stock Issued During Period, Value, New Issues	$ 382
Additional Paid in Capital, Common Stock	6,112
Other Assets, Noncurrent	33
Accumulated Other Comprehensive Income (Loss), Net of Tax	3
Stockholders' Equity Attributable to Noncontrolling Interest	4,629
Deferred Tax Liabilities, Net, Noncurrent	$ 1,829
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accounting Standards Update 2018-02 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets													$ (61)
Maximum [Member] \| Accounting Standards Update 2016-02 [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Operating Lease Right Of Use Asset Percentage Of Total Assets									1.00%
Basis Of Presentation [Abstract]
Operating Lease Liability Percentage Of Total Liabilities									1.00%
Regulatory Charges In Operating Expenses Resulting From Tax Reform [Member]
Basis Of Presentation [Abstract]
Regulatory Liabilities									$ 657