Investing Activities (Details) - USD ($) $ in Millions				12 Months Ended
		Nov. 18, 2020	Dec. 31, 2019	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Schedule of Investments [Line Items]
Income (Loss) from Equity Method Investments				$ (637)		$ (608)		$ (328)
Impairment of equity-method investments				0		0		1,046
Other investing income (loss) - net				16		7		8
Equity-method investment, payments to purchase or contributions				166		115		325
Equity-method investments				5,048		5,121
Other Investments and Securities, at Cost				17		6
Investments				5,065		5,127
Equity-method investment, difference between carrying amount and underlying equity				1,100		1,200
Distributions from equity-method investees (Note 8)				865		757		653
Current assets				3,797		4,549
Current liabilities				(4,890)		(4,972)
Revenues				10,965		10,627		7,719
Operating income				1,268		1,191		508
Net income				2,117		1,562		198
Equity Method Investee [Member]
Schedule of Investments [Line Items]
Accounts Payable, Related Parties, Current				87		89
OperatingFeesAndCostsBilledToThirdParty				65		70		79
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Investments [Line Items]
Current assets				964		743
Noncurrent assets				12,701		13,211
Current liabilities				(632)		(435)
Noncurrent liabilities				(3,789)		(3,774)
Revenues				5,520		4,688		2,625
Net income				$ 1,102		1,006		459
Appalachia Midstream Investments [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				66.00%
Income (Loss) from Equity Method Investments								26
Equity-method investment, payments to purchase or contributions				$ 83		84		116
Equity-method investments	[1]			2,975		3,056
Equity-method investment, difference between carrying amount and underlying equity				1,100		1,200
Distributions from equity-method investees (Note 8)				$ 415		433		357
Rocky Mountain Midstream Holdings LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				50.00%
Income (Loss) from Equity Method Investments								78
Equity-method investments				$ 395		401
Distributions from equity-method investees (Note 8)				$ 52		45		39
Discovery Producer Services LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				60.00%
Equity-method investment, payments to purchase or contributions				$ 41		0		0
Equity-method investments				345		328
Distributions from equity-method investees (Note 8)				$ 49		44		21
Blue Racer Midstream Holdings LLC
Schedule of Investments [Line Items]
Equity-method investment, payments to purchase or contributions	[2]							157
Distributions from equity-method investees (Note 8)	[3]							47
Overland Pass Pipeline Company LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				50.00%
Equity-method investments				$ 386		388
Distributions from equity-method investees (Note 8)				$ 34		26		50
Laurel Mountain Midstream, LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				69.00%
Income (Loss) from Equity Method Investments								11
Equity-method investments				$ 205		226
Distributions from equity-method investees (Note 8)				$ 112		33		31
Gulfstream Natural Gas System, LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				50.00%
Equity-method investment, payments to purchase or contributions				$ 14		26		3
Equity-method investments				220		215
Distributions from equity-method investees (Note 8)				89		90		93
Other [Member]
Schedule of Investments [Line Items]
Equity-method investment, payments to purchase or contributions				12		2		49
Equity-method investments				139		130
Distributions from equity-method investees (Note 8)				65		39		15
Total Equity Method Investment [Member]
Schedule of Investments [Line Items]
Distributions from equity-method investees (Note 8)				$ 865		757		653
Blue Racer Midstream LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				50.00%
Income (Loss) from Equity Method Investments								10
Equity-method investment, payments to purchase or contributions		$ 157		$ 0	[2]	3	[2]
Equity-method investments				383		377
Distributions from equity-method investees (Note 8)	[3]			49		47
Cardinal Pipeline Company, LLC
Schedule of Investments [Line Items]
Equity-method investment, payments to purchase or contributions				$ 16		$ 0		$ 0
Northeast G And P [Member] | Blue Racer Midstream Holdings LLC
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage			58.00%
Northeast G And P [Member] | Laurel Mountain Midstream, LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				69.00%
Northeast G And P [Member] | Blue Racer Midstream LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				50.00%		50.00%
West [Member] | Rocky Mountain Midstream Holdings LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				50.00%
West [Member] | Overland Pass Pipeline Company LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				50.00%
West [Member] | Targa Train 7 LLC [Member]
Schedule of Investments [Line Items]
Equity Method Investment, Ownership Percentage				20.00%
Caiman Energy II Acquisition [Member] | Blue Racer Midstream Holdings LLC
Schedule of Investments [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		41.00%
Blue Racer Midstream Holdings LLC | Blue Racer Midstream LLC [Member]
Schedule of Investments [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest			50.00%
Beneficial Owner [Member] | Williams Companies Inc [Member] | Blue Racer Midstream LLC [Member]
Schedule of Investments [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest			29.00%

[1] Includes equity-method investments in multiple gathering systems in the Marcellus Shale region with an approximate average 66 percent interest.

[2] See following discussion in the section Acquisition of additional interests in BRMH below.

[3] See previous discussion in the section Acquisition of additional interests in BRMH above.