Segment Disclosures Recon from Segment to Consolidated - Revenues (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment revenues [Line Items]
Revenues		$ 2,336	$ 2,483	$ 5,107	$ 5,564
Other financial information:
Proportional Modified EBITDA Equity Method Investments		238	249	466	478
Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(215)	(169)	(463)	(355)
Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		1,068	1,042	2,187	2,049
Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		483	514	992	1,023
Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		621	500	1,322	1,003
Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	291	505	861	1,636
Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		88	91	208	208
Service [Member]
Segment revenues [Line Items]
Revenues		1,837	1,748	3,742	3,442
Service [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		999	933	2,028	1,848
Service [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		462	480	937	923
Service [Member] | West [Member]
Segment revenues [Line Items]
Revenues		372	330	769	662
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	5	8	8
Service [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(62)	(60)	(126)	(120)
Service [Member] | Intersegment Eliminations [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		(24)	(23)	(44)	(48)
Service [Member] | Intersegment Eliminations [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		(3)	(9)	(7)	(20)
Service [Member] | Intersegment Eliminations [Member] | West [Member]
Segment revenues [Line Items]
Revenues		(35)	(28)	(75)	(52)
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		1,023	956	2,072	1,896
Service [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		465	489	944	943
Service [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		407	358	844	714
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	5	8	8
NonRegulated Service Commodity Consideration [Member]
Segment revenues [Line Items]
Revenues		18	27	48	63
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		5	6	14	18
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		(5)	(3)	0	3
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		18	24	34	42
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		610	593	1,455	1,438
Product [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		25	57	55	81
Product [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		5	11	7	19
Product [Member] | West [Member]
Segment revenues [Line Items]
Revenues		34	10	106	29
Product [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	508	487	1,215	1,263
Product [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		38	28	72	46
Product [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(153)	(109)	(337)	(235)
Product [Member] | Intersegment Eliminations [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		(15)	(22)	(46)	(53)
Product [Member] | Intersegment Eliminations [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		(18)	(17)	(41)	(58)
Product [Member] | Intersegment Eliminations [Member] | West [Member]
Segment revenues [Line Items]
Revenues		(157)	(75)	(333)	(146)
Product [Member] | Intersegment Eliminations [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	85	60	205	161
Product [Member] | Intersegment Eliminations [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		(48)	(55)	(122)	(139)
Product [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		40	79	101	134
Product [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		23	28	48	77
Product [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		191	85	439	175
Product [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	423	427	1,010	1,102
Product [Member] | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		86	83	194	185
Energy Commodities and Service
Segment revenues [Line Items]
Revenues	[2]	(129)	115	(138)	621
Energy Commodities and Service | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		(5)	3	81	177
Energy Commodities and Service | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		(124)	112	(219)	444
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	1
Energy Commodities and Service | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	1	0	1
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]	5	33	5	72
Energy Commodities and Service | Operating Segments [Member] | West [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		5	33	5	72
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]	(132)	78	(149)	533
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues	[1]	(33)	(45)	48	72
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues	[1]	(99)	123	(197)	461
Energy Commodities and Service | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues	[2]	(2)	3	6	15
Energy Commodities and Service | Operating Segments [Member] | Other [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		23	14	28	32
Energy Commodities and Service | Operating Segments [Member] | Other [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		$ (25)	$ (11)	$ (22)	$ (17)

[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.