Segment Disclosures Recon from Segment to Consolidated - Revenues (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment revenues [Line Items]
Revenues		$ 2,653	$ 2,559	$ 7,760	$ 8,123
Other financial information:
Proportional Modified EBITDA Equity Method Investments		227	215	693	693
Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(267)	(220)	(730)	(575)
Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		1,170	1,053	3,357	3,102
Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		502	505	1,494	1,528
Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		663	533	1,985	1,536
Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	482	558	1,343	2,194
Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		103	130	311	338
Service [Member]
Segment revenues [Line Items]
Revenues		1,911	1,770	5,653	5,212
Service [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		1,049	953	3,077	2,801
Service [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		473	473	1,410	1,396
Service [Member] | West [Member]
Segment revenues [Line Items]
Revenues		385	340	1,154	1,002
Service [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	0	0	0	1
Service [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		4	4	12	12
Service [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(66)	(64)	(192)	(184)
Service [Member] | Intersegment Eliminations [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		(23)	(25)	(67)	(73)
Service [Member] | Intersegment Eliminations [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		(2)	(5)	(9)	(25)
Service [Member] | Intersegment Eliminations [Member] | West [Member]
Segment revenues [Line Items]
Revenues		(41)	(34)	(116)	(86)
Service [Member] | Intersegment Eliminations [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	0	0	0	0
Service [Member] | Intersegment Eliminations [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		0	0	0	0
Service [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		1,072	978	3,144	2,874
Service [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		475	478	1,419	1,421
Service [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		426	374	1,270	1,088
Service [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	0	0	0	1
Service [Member] | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		4	4	12	12
NonRegulated Service Commodity Consideration [Member]
Segment revenues [Line Items]
Revenues		34	45	82	108
NonRegulated Service Commodity Consideration [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		0	0	0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		14	11	28	29
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		1	0	1	3
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		19	34	53	76
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	0	0	0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		0	0	0	0
Product [Member]
Segment revenues [Line Items]
Revenues		703	720	2,158	2,158
Product [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		30	35	85	116
Product [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		8	13	15	32
Product [Member] | West [Member]
Segment revenues [Line Items]
Revenues		47	14	153	43
Product [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	585	619	1,800	1,882
Product [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		33	39	105	85
Product [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(201)	(156)	(538)	(391)
Product [Member] | Intersegment Eliminations [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		(54)	(28)	(100)	(81)
Product [Member] | Intersegment Eliminations [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		(18)	(14)	(59)	(72)
Product [Member] | Intersegment Eliminations [Member] | West [Member]
Segment revenues [Line Items]
Revenues		(171)	(98)	(504)	(244)
Product [Member] | Intersegment Eliminations [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	104	63	309	224
Product [Member] | Intersegment Eliminations [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		(62)	(79)	(184)	(218)
Product [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		84	63	185	197
Product [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		26	27	74	104
Product [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		218	112	657	287
Product [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	481	556	1,491	1,658
Product [Member] | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		95	118	289	303
Energy Commodities and Service
Segment revenues [Line Items]
Revenues	[2]	5	24	(133)	645
Energy Commodities and Service | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		(7)	(8)	74	169
Energy Commodities and Service | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		12	32	(207)	476
Energy Commodities and Service | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues	[2]	0	0	0	0
Energy Commodities and Service | Intersegment Eliminations [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0	0
Energy Commodities and Service | Intersegment Eliminations [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0	0
Energy Commodities and Service | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues	[2]	0	1	0	2
Energy Commodities and Service | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	1	0	2
Energy Commodities and Service | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0	0
Energy Commodities and Service | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues	[2]	0	0	0	0
Energy Commodities and Service | Operating Segments [Member] | Northeast G And P [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0	0
Energy Commodities and Service | Operating Segments [Member] | Northeast G And P [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0	0
Energy Commodities and Service | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues	[2]	0	13	5	85
Energy Commodities and Service | Operating Segments [Member] | West [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	13	5	85
Energy Commodities and Service | Operating Segments [Member] | West [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0	0
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1],[2]	1	2	(148)	535
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues	[1]	(8)	(31)	40	41
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues	[1]	9	33	(188)	494
Energy Commodities and Service | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues	[2]	4	8	10	23
Energy Commodities and Service | Operating Segments [Member] | Other [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		1	9	29	41
Energy Commodities and Service | Operating Segments [Member] | Other [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		$ 3	$ (1)	$ (19)	$ (18)

[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 commodity 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 from commodity derivatives held for energy trading purposes are presented on a net basis in revenue.