Segment Disclosures Recon from Segment to Consolidated - Revenues (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment revenues [Line Items]
Revenues		$ 10,907	$ 10,965	$ 10,627
Other financial information:
Additions to long-lived assets		4,313	3,598	1,855
Proportional Modified EBITDA Equity Method Investments		939	979	970
Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(795)	(1,329)	(1,375)
Other financial information:
Additions to long-lived assets		0	0	0
Proportional Modified EBITDA Equity Method Investments		0	0	0
Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		4,150	4,047	3,786
Other financial information:
Additions to long-lived assets		2,501	1,420	861
Proportional Modified EBITDA Equity Method Investments		205	193	183
Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		2,033	1,802	1,634
Other financial information:
Additions to long-lived assets		340	261	164
Proportional Modified EBITDA Equity Method Investments		574	654	682
Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		2,135	2,561	2,026
Other financial information:
Additions to long-lived assets		1,186	1,507	209
Proportional Modified EBITDA Equity Method Investments		162	132	105
Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	2,878	3,233	4,211
Other financial information:
Additions to long-lived assets	[1]	7	4	1
Proportional Modified EBITDA Equity Method Investments	[1]	0	0	0
Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		506	651	345
Other financial information:
Additions to long-lived assets		279	406	620
Proportional Modified EBITDA Equity Method Investments		(2)	0	0
Service [Member]
Segment revenues [Line Items]
Revenues		7,026	6,536	6,001
Service [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		3,766	3,461	3,310
Service [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		1,868	1,613	1,490
Service [Member] | West [Member]
Segment revenues [Line Items]
Revenues		1,376	1,443	1,178
Service [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	1	3	3
Service [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		15	16	20
Service [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(247)	(266)	(195)
Service [Member] | Intersegment Eliminations [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		(92)	(118)	(75)
Service [Member] | Intersegment Eliminations [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		(28)	(41)	(38)
Service [Member] | Intersegment Eliminations [Member] | West [Member]
Segment revenues [Line Items]
Revenues		(126)	(99)	(70)
Service [Member] | Intersegment Eliminations [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	0	0	0
Service [Member] | Intersegment Eliminations [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		(1)	(8)	(12)
Service [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		3,858	3,579	3,385
Service [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		1,896	1,654	1,528
Service [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		1,502	1,542	1,248
Service [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	1	3	3
Service [Member] | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		16	24	32
NonRegulated Service Commodity Consideration [Member]
Segment revenues [Line Items]
Revenues		146	260	238
NonRegulated Service Commodity Consideration [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		0	0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		38	64	52
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		5	14	7
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		103	182	179
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	0	0	0
NonRegulated Service Commodity Consideration [Member] | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		0	0	0
Product [Member]
Segment revenues [Line Items]
Revenues		2,779	4,556	4,536
Product [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		146	228	231
Product [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		34	28	13
Product [Member] | West [Member]
Segment revenues [Line Items]
Revenues		80	145	60
Product [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	2,382	4,052	4,094
Product [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		137	103	138
Product [Member] | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues		(548)	(1,063)	(1,180)
Product [Member] | Intersegment Eliminations [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		(106)	(176)	(118)
Product [Member] | Intersegment Eliminations [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		(98)	(106)	(86)
Product [Member] | Intersegment Eliminations [Member] | West [Member]
Segment revenues [Line Items]
Revenues		(361)	(696)	(583)
Product [Member] | Intersegment Eliminations [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	322	518	(198)
Product [Member] | Intersegment Eliminations [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		(305)	(603)	(195)
Product [Member] | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues		252	404	349
Product [Member] | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues		132	134	99
Product [Member] | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues		441	841	643
Product [Member] | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1]	2,060	3,534	4,292
Product [Member] | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues		442	706	333
Energy Commodities and Service
Segment revenues [Line Items]
Revenues	[2]	956	(387)	(148)
Energy Commodities and Service | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		253	(91)	(39)
Energy Commodities and Service | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		703	(296)	(109)
Energy Commodities and Service | Intersegment Eliminations [Member]
Segment revenues [Line Items]
Revenues	[2]	0	0	0
Energy Commodities and Service | Intersegment Eliminations [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0
Energy Commodities and Service | Intersegment Eliminations [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0
Energy Commodities and Service | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member]
Segment revenues [Line Items]
Revenues	[2]	2	0	0
Energy Commodities and Service | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		2	0	0
Energy Commodities and Service | Operating Segments [Member] | Transmission And Gulf Of Mexico [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0
Energy Commodities and Service | Operating Segments [Member] | Northeast G And P [Member]
Segment revenues [Line Items]
Revenues	[2]	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
Energy Commodities and Service | Operating Segments [Member] | Northeast G And P [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0
Energy Commodities and Service | Operating Segments [Member] | West [Member]
Segment revenues [Line Items]
Revenues	[2]	89	(4)	(44)
Energy Commodities and Service | Operating Segments [Member] | West [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		89	(4)	(44)
Energy Commodities and Service | Operating Segments [Member] | West [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		0	0	0
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services
Segment revenues [Line Items]
Revenues	[1],[2]	817	(304)	(84)
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues	[1]	115	17	25
Energy Commodities and Service | Operating Segments [Member] | Gas & NGL Marketing Services | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues	[1]	702	(321)	(109)
Energy Commodities and Service | Operating Segments [Member] | Other [Member]
Segment revenues [Line Items]
Revenues	[2]	48	(79)	(20)
Energy Commodities and Service | Operating Segments [Member] | Other [Member] | Realized Gain (Loss)
Segment revenues [Line Items]
Revenues		47	(104)	(20)
Energy Commodities and Service | Operating Segments [Member] | Other [Member] | Unrealized Gain (Loss)
Segment revenues [Line Items]
Revenues		$ 1	$ 25	$ 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 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.