Business Segments and Related Information - Schedule of Total Segment Revenues as Reported in the Preceding Tables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment revenues:
Total revenues	$ 12,023	$ 13,775	$ 38,803	$ 42,018
NGL Pipelines & Services
Segment revenues:
Total revenues	3,465	4,831	12,271	14,236
Crude Oil Pipelines & Services
Segment revenues:
Total revenues	5,396	5,251	15,300	16,554
Natural Gas Pipelines & Services
Segment revenues:
Total revenues	932	649	3,224	2,115
Petrochemical & Refined Products Services
Segment revenues:
Total revenues	2,230	3,044	8,008	9,113
Operating Segments
Segment revenues:
Total revenues	45,364	45,607	139,537	138,185
Operating Segments | NGL Pipelines & Services
Segment revenues:
Total revenues	21,048	15,875	63,875	48,393
Operating Segments | Crude Oil Pipelines & Services
Segment revenues:
Total revenues	16,900	18,929	46,750	59,101
Operating Segments | Natural Gas Pipelines & Services
Segment revenues:
Total revenues	1,167	815	3,893	2,596
Operating Segments | Petrochemical & Refined Products Services
Segment revenues:
Total revenues	6,249	9,988	25,019	28,095
Intersegment Eliminations
Segment revenues:
Total revenues	(33,341)	(31,832)	(100,734)	(96,167)
Intersegment Eliminations | NGL Pipelines & Services
Segment revenues:
Total revenues	(17,583)	(11,044)	(51,604)	(34,157)
Intersegment Eliminations | Crude Oil Pipelines & Services
Segment revenues:
Total revenues	(11,504)	(13,678)	(31,450)	(42,547)
Intersegment Eliminations | Natural Gas Pipelines & Services
Segment revenues:
Total revenues	(235)	(166)	(669)	(481)
Intersegment Eliminations | Petrochemical & Refined Products Services
Segment revenues:
Total revenues	$ (4,019)	$ (6,944)	$ (17,011)	$ (18,982)