Segment Disclosures Reconciliation of Segment Revenues to Consolidated (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment revenues
Revenues		$ 2,483	$ 2,490	$ 5,564	$ 5,014
Intersegment Elimination [Member]
Segment revenues
Revenues		(169)	(402)	(355)	(751)
Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		1,042	1,002	2,049	1,997
Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		514	448	1,023	871
Operating Segments [Member] | West [Member]
Segment revenues
Revenues		500	687	1,003	1,249
Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	505	559	1,636	1,413
Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		91	196	208	235
Service [Member]
Segment revenues
Revenues		1,748	1,606	3,442	3,143
Service [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		933	838	1,848	1,683
Service [Member] | Northeast G And P [Member]
Segment revenues
Revenues		480	400	923	770
Service [Member] | West [Member]
Segment revenues
Revenues		330	364	662	680
Service [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	0	0	1	1
Service [Member] | Other [Member]
Segment revenues
Revenues		5	4	8	9
Service [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		(60)	(62)	(120)	(120)
Service [Member] | Intersegment Elimination [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		(23)	(29)	(48)	(58)
Service [Member] | Intersegment Elimination [Member] | Northeast G And P [Member]
Segment revenues
Revenues		(9)	(11)	(20)	(21)
Service [Member] | Intersegment Elimination [Member] | West [Member]
Segment revenues
Revenues		(28)	(19)	(52)	(34)
Service [Member] | Intersegment Elimination [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	0	0	0	0
Service [Member] | Intersegment Elimination [Member] | Other [Member]
Segment revenues
Revenues		0	(3)	0	(7)
Service [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		956	867	1,896	1,741
Service [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		489	411	943	791
Service [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		358	383	714	714
Service [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	0	0	1	1
Service [Member] | Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		5	7	8	16
NonRegulated Service Commodity Consideration [Member]
Segment revenues
Revenues		27	86	63	163
NonRegulated Service Commodity Consideration [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		0	0	0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		6	22	18	43
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		(3)	3	3	10
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		24	61	42	110
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	0	0	0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		0	0	0	0
Product [Member]
Segment revenues
Revenues		593	1,111	1,438	2,215
Product [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		57	58	81	109
Product [Member] | Northeast G And P [Member]
Segment revenues
Revenues		11	8	19	13
Product [Member] | West [Member]
Segment revenues
Revenues		10	39	29	50
Product [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	487	979	1,263	1,994
Product [Member] | Other [Member]
Segment revenues
Revenues		28	27	46	49
Product [Member] | Intersegment Elimination [Member]
Segment revenues
Revenues		(109)	(340)	(235)	(631)
Product [Member] | Intersegment Elimination [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		(22)	(55)	(53)	(104)
Product [Member] | Intersegment Elimination [Member] | Northeast G And P [Member]
Segment revenues
Revenues		(17)	(26)	(58)	(57)
Product [Member] | Intersegment Elimination [Member] | West [Member]
Segment revenues
Revenues		(75)	(213)	(146)	(389)
Product [Member] | Intersegment Elimination [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	60	107	161	154
Product [Member] | Intersegment Elimination [Member] | Other [Member]
Segment revenues
Revenues		(55)	(153)	(139)	(235)
Product [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues		79	113	134	213
Product [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues
Revenues		28	34	77	70
Product [Member] | Operating Segments [Member] | West [Member]
Segment revenues
Revenues		85	252	175	439
Product [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues
Revenues	[1]	427	872	1,102	1,840
Product [Member] | Operating Segments [Member] | Other [Member]
Segment revenues
Revenues		83	180	185	284
Energy Commodities and Service
Segment revenues
Revenues	[2]	115	(313)	621	(507)
Energy Commodities and Service | Realized Gain (Loss)
Segment revenues
Revenues		3	(63)	177	(132)
Energy Commodities and Service | Unrealized Gain (Loss)
Segment revenues
Revenues		112	(250)	444	(375)
Energy Commodities and Service | Transmission And Gulf Of Mexico [Member]
Segment revenues
Revenues	[2]	1	0	1	0
Energy Commodities and Service | Transmission And Gulf Of Mexico [Member] | Realized Gain (Loss)
Segment revenues
Revenues		1	0	1	0
Energy Commodities and Service | Transmission And Gulf Of Mexico [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		0	0	0	0
Energy Commodities and Service | Northeast G And P [Member]
Segment revenues
Revenues	[2]	0	0	0	0
Energy Commodities and Service | Northeast G And P [Member] | Realized Gain (Loss)
Segment revenues
Revenues		0	0	0	0
Energy Commodities and Service | Northeast G And P [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		0	0	0	0
Energy Commodities and Service | West [Member]
Segment revenues
Revenues	[2]	33	(9)	72	(14)
Energy Commodities and Service | West [Member] | Realized Gain (Loss)
Segment revenues
Revenues		33	(9)	72	(14)
Energy Commodities and Service | West [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		0	0	0	0
Energy Commodities and Service | Gas & NGL Marketing Services
Segment revenues
Revenues	[1],[2]	78	(313)	533	(428)
Energy Commodities and Service | Gas & NGL Marketing Services | Realized Gain (Loss)
Segment revenues
Revenues	[1]	(45)	(16)	72	(72)
Energy Commodities and Service | Gas & NGL Marketing Services | Unrealized Gain (Loss)
Segment revenues
Revenues	[1]	123	(297)	461	(356)
Energy Commodities and Service | Other [Member]
Segment revenues
Revenues	[2]	3	9	15	(65)
Energy Commodities and Service | Other [Member] | Realized Gain (Loss)
Segment revenues
Revenues		14	(38)	32	(46)
Energy Commodities and Service | Other [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		(11)	47	(17)	(19)
Energy Commodities and Service | Intersegment Elimination [Member]
Segment revenues
Revenues	[2]	0	0	0	0
Energy Commodities and Service | Intersegment Elimination [Member] | Realized Gain (Loss)
Segment revenues
Revenues		0	0	0	0
Energy Commodities and Service | Intersegment Elimination [Member] | Unrealized Gain (Loss)
Segment revenues
Revenues		$ 0	$ 0	$ 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.