Segment Disclosures Reconciliation of Segment Revenues to Consolidated (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Segment revenues
Revenues		$ 3,081	$ 2,524
Intersegment Elimination [Member]
Segment revenues
Revenues		(186)	(349)
Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		1,007	995
Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		509	423
Operating Segments [Member] | West [Member]
Segment revenues
Revenues		503	562
Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	1,131	854
Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		117	39
Service [Member]
Segment revenues
Revenues		1,694	1,537
Service [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		915	845
Service [Member] | Northeast G And P [Member]
Segment revenues
Revenues		443	370
Service [Member] | West [Member]
Segment revenues
Revenues		332	316
Service [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	1	1
Service [Member] | Other [Member]
Segment revenues
Revenues		3	5
Service [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		(60)	(58)
Service [Member] | Intersegment Elimination [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		(25)	(29)
Service [Member] | Intersegment Elimination [Member] | Northeast G And P [Member]
Segment revenues
Revenues		(11)	(10)
Service [Member] | Intersegment Elimination [Member] | West [Member]
Segment revenues
Revenues		(24)	(15)
Service [Member] | Intersegment Elimination [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	0	0
Service [Member] | Intersegment Elimination [Member] | Other [Member]
Segment revenues
Revenues		0	(4)
Service [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		940	874
Service [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		454	380
Service [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		356	331
Service [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	1	1
Service [Member] | Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		3	9
NonRegulated Service Commodity Consideration [Member]
Segment revenues
Revenues		36	77
NonRegulated Service Commodity Consideration [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		12	21
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		6	7
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		18	49
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		0	0
Product [Member]
Segment revenues
Revenues		845	1,104
Product [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		24	51
Product [Member] | Northeast G And P [Member]
Segment revenues
Revenues		8	5
Product [Member] | West [Member]
Segment revenues
Revenues		19	11
Product [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	776	1,015
Product [Member] | Other [Member]
Segment revenues
Revenues		18	22
Product [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		(126)	(291)
Product [Member] | Intersegment Elimination [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		(31)	(49)
Product [Member] | Intersegment Elimination [Member] | Northeast G And P [Member]
Segment revenues
Revenues		(41)	(31)
Product [Member] | Intersegment Elimination [Member] | West [Member]
Segment revenues
Revenues		(71)	(176)
Product [Member] | Intersegment Elimination [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	101	47
Product [Member] | Intersegment Elimination [Member] | Other [Member]
Segment revenues
Revenues		(84)	(82)
Product [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		55	100
Product [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		49	36
Product [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		90	187
Product [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	675	968
Product [Member] | Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		102	104
Energy Commodities and Service
Segment revenues
Revenues	[2]	506	(194)
Energy Commodities and Service | Realized Gain (Loss)
Segment revenues
Revenues		174	(69)
Energy Commodities and Service | Unrealized Gain (Loss)
Segment revenues
Revenues		332	(125)
Energy Commodities and Service | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues	[2]	0	0
Energy Commodities and Service | Transmission And Gulf Of Mexico [Member] | Realized Gain (Loss)
Segment revenues
Revenues		0	0
Energy Commodities and Service | Transmission And Gulf Of Mexico [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		0	0
Energy Commodities and Service | Northeast G And P [Member]
Segment revenues
Revenues	[2]	0	0
Energy Commodities and Service | Northeast G And P [Member] | Realized Gain (Loss)
Segment revenues
Revenues		0	0
Energy Commodities and Service | Northeast G And P [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		0	0
Energy Commodities and Service | West [Member]
Segment revenues
Revenues	[2]	39	(5)
Energy Commodities and Service | West [Member] | Realized Gain (Loss)
Segment revenues
Revenues		39	(5)
Energy Commodities and Service | West [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		0	0
Energy Commodities and Service | Gas & NGL Marketing Services
Segment revenues
Revenues	[1],[2]	455	(115)
Energy Commodities and Service | Gas & NGL Marketing Services | Realized Gain (Loss)
Segment revenues
Revenues	[1]	117	(56)
Energy Commodities and Service | Gas & NGL Marketing Services | Unrealized Gain (Loss)
Segment revenues
Revenues	[1]	338	(59)
Energy Commodities and Service | Other [Member]
Segment revenues
Revenues	[2]	12	(74)
Energy Commodities and Service | Other [Member] | Realized Gain (Loss)
Segment revenues
Revenues		18	(8)
Energy Commodities and Service | Other [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		(6)	(66)
Energy Commodities and Service | Intersegment Elimination [Member]
Segment revenues
Revenues	[2]	0	0
Energy Commodities and Service | Intersegment Elimination [Member] | Realized Gain (Loss)
Segment revenues
Revenues		0	0
Energy Commodities and Service | Intersegment Elimination [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		$ 0	$ 0

[1] As we are acting as agent for natural gas marketing customers or engage in energy trading activities, the resulting revenues are presented net of the related costs of those activities.

[2] We record transactions that qualify as derivatives at fair value with changes in fair value recognized in earnings in the period of change and characterized as unrealized gains or losses. Gains and losses on derivatives held for energy trading purposes are presented on a net basis in revenue.