Segment Disclosures Reconciliation of Segment Revenues to Consolidated (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Segment revenues
Revenues		$ 2,524	$ 2,612
Intersegment Elimination [Member]
Segment revenues
Revenues		(349)	(287)
Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		995	912
Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		423	393
Operating Segments [Member] | West [Member]
Segment revenues
Revenues		562	476
Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	854	1,055
Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		39	63
Service [Member]
Segment revenues
Revenues		1,537	1,452
Service [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		845	822
Service [Member] | Northeast G And P [Member]
Segment revenues
Revenues		370	347
Service [Member] | West [Member]
Segment revenues
Revenues		316	278
Service [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	1	1
Service [Member] | Other [Member]
Segment revenues
Revenues		5	4
Service [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		(58)	(39)
Service [Member] | Intersegment Elimination [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		(29)	(12)
Service [Member] | Intersegment Elimination [Member] | Northeast G And P [Member]
Segment revenues
Revenues		(10)	(11)
Service [Member] | Intersegment Elimination [Member] | West [Member]
Segment revenues
Revenues		(15)	(13)
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		(4)	(3)
Service [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		874	834
Service [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		380	358
Service [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		331	291
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		9	7
NonRegulated Service Commodity Consideration [Member]
Segment revenues
Revenues		77	49
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		21	11
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		7	3
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		49	35
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		1,104	1,147
Product [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		51	40
Product [Member] | Northeast G And P [Member]
Segment revenues
Revenues		5	4
Product [Member] | West [Member]
Segment revenues
Revenues		11	15
Product [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	1,015	1,039
Product [Member] | Other [Member]
Segment revenues
Revenues		22	49
Product [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		(291)	(248)
Product [Member] | Intersegment Elimination [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		(49)	(27)
Product [Member] | Intersegment Elimination [Member] | Northeast G And P [Member]
Segment revenues
Revenues		(31)	(28)
Product [Member] | Intersegment Elimination [Member] | West [Member]
Segment revenues
Revenues		(176)	(137)
Product [Member] | Intersegment Elimination [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	47	(49)
Product [Member] | Intersegment Elimination [Member] | Other [Member]
Segment revenues
Revenues		(82)	(7)
Product [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		100	67
Product [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		36	32
Product [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		187	152
Product [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	968	1,088
Product [Member] | Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		104	56
Energy Commodities and Service
Segment revenues
Revenues	[2]	(194)	(36)
Energy Commodities and Service | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues	[2]	0	0
Energy Commodities and Service | Northeast G And P [Member]
Segment revenues
Revenues	[2]	0	0
Energy Commodities and Service | West [Member]
Segment revenues
Revenues	[2]	(5)	(2)
Energy Commodities and Service | Gas & NGL Marketing Services
Segment revenues
Revenues	[1],[2]	(115)	(34)
Energy Commodities and Service | Other [Member]
Segment revenues
Revenues	[2]	(74)	0
Energy Commodities and Service | Intersegment Elimination [Member]
Segment revenues
Revenues	[2]	$ 0	$ 0

[1] See Note 1 – General, Description of Business, and Basis of Presentation.

[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.