Business Segments and Related Information - Schedule of Total Segment Revenues as Reported in the Preceding Tables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment revenues:
Total revenues	$ 11,363	$ 13,483	$ 26,780	$ 28,243
NGL Pipelines & Services
Segment revenues:
Total revenues	3,406	4,265	8,806	9,405
Crude Oil Pipelines & Services
Segment revenues:
Total revenues	4,783	5,888	9,904	11,303
Natural Gas Pipelines & Services
Segment revenues:
Total revenues	1,071	612	2,292	1,466
Petrochemical & Refined Products Services
Segment revenues:
Total revenues	2,103	2,718	5,778	6,069
Operating Segments
Segment revenues:
Total revenues	43,690	45,935	94,173	92,578
Operating Segments | NGL Pipelines & Services
Segment revenues:
Total revenues	20,410	15,823	42,827	32,518
Operating Segments | Crude Oil Pipelines & Services
Segment revenues:
Total revenues	14,107	20,930	29,850	40,172
Operating Segments | Natural Gas Pipelines & Services
Segment revenues:
Total revenues	1,273	750	2,726	1,781
Operating Segments | Petrochemical & Refined Products Services
Segment revenues:
Total revenues	7,900	8,432	18,770	18,107
Intersegment Eliminations
Segment revenues:
Total revenues	(32,327)	(32,452)	(67,393)	(64,335)
Intersegment Eliminations | NGL Pipelines & Services
Segment revenues:
Total revenues	(17,004)	(11,558)	(34,021)	(23,113)
Intersegment Eliminations | Crude Oil Pipelines & Services
Segment revenues:
Total revenues	(9,324)	(15,042)	(19,946)	(28,869)
Intersegment Eliminations | Natural Gas Pipelines & Services
Segment revenues:
Total revenues	(202)	(138)	(434)	(315)
Intersegment Eliminations | Petrochemical & Refined Products Services
Segment revenues:
Total revenues	$ (5,797)	$ (5,714)	$ (12,992)	$ (12,038)