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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment revenues:
Total revenues	$ 18,269	$ 11,363	$ 32,655	$ 26,780
NGL Pipelines & Services
Segment revenues:
Total revenues	5,234	3,406	9,266	8,806
Crude Oil Pipelines & Services
Segment revenues:
Total revenues	8,339	4,783	14,638	9,904
Natural Gas Pipelines & Services
Segment revenues:
Total revenues	659	1,071	1,766	2,292
Petrochemical & Refined Products Services
Segment revenues:
Total revenues	4,037	2,103	6,985	5,778
Operating Segments
Segment revenues:
Total revenues	63,556	43,690	111,487	94,173
Operating Segments | NGL Pipelines & Services
Segment revenues:
Total revenues	23,921	20,410	44,501	42,827
Operating Segments | Crude Oil Pipelines & Services
Segment revenues:
Total revenues	25,260	14,107	43,286	29,850
Operating Segments | Natural Gas Pipelines & Services
Segment revenues:
Total revenues	892	1,273	2,351	2,726
Operating Segments | Petrochemical & Refined Products Services
Segment revenues:
Total revenues	13,483	7,900	21,349	18,770
Intersegment Eliminations
Segment revenues:
Total revenues	(45,287)	(32,327)	(78,832)	(67,393)
Intersegment Eliminations | NGL Pipelines & Services
Segment revenues:
Total revenues	(18,687)	(17,004)	(35,235)	(34,021)
Intersegment Eliminations | Crude Oil Pipelines & Services
Segment revenues:
Total revenues	(16,921)	(9,324)	(28,648)	(19,946)
Intersegment Eliminations | Natural Gas Pipelines & Services
Segment revenues:
Total revenues	(233)	(202)	(585)	(434)
Intersegment Eliminations | Petrochemical & Refined Products Services
Segment revenues:
Total revenues	$ (9,446)	$ (5,797)	$ (14,364)	$ (12,992)