Business Segments and Related Information - Schedule of Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment revenues:
Revenues	$ 18,269	$ 11,363	$ 32,655	$ 26,780
Significant segment expenses:
Cost of sales	14,160	7,899	24,838	19,904
Other segment income (expense):
Equity in income of unconsolidated affiliates	109	92	185	186
NGL Pipelines & Services
Segment revenues:
Revenues	5,234	3,406	9,266	8,806
Other segment income (expense):
Equity in income of unconsolidated affiliates	21	18	40	38
Crude Oil Pipelines & Services
Segment revenues:
Revenues	8,339	4,783	14,638	9,904
Other segment income (expense):
Equity in income of unconsolidated affiliates	86	72	140	144
Natural Gas Pipelines & Services
Segment revenues:
Revenues	659	1,071	1,766	2,292
Other segment income (expense):
Equity in income of unconsolidated affiliates	1	0	3	2
Petrochemical & Refined Products Services
Segment revenues:
Revenues	4,037	2,103	6,985	5,778
Other segment income (expense):
Equity in income of unconsolidated affiliates	1	2	2	2
Nonrelated Party
Segment revenues:
Revenues	18,255	11,352	32,625	26,756
Related parties
Segment revenues:
Revenues	14	11	30	24
Operating Segments
Segment revenues:
Revenues	63,556	43,690	111,487	94,173
Significant segment expenses:
Cost of sales	59,153	39,950	103,071	86,745
Variable operating costs and expenses	402	365	810	727
Fixed operating costs and expenses	1,138	1,008	2,220	2,003
Total significant segment expenses	60,693	41,323	106,101	89,475
Other segment income (expense):
Equity in income of unconsolidated affiliates	109	92	185	186
Other segment items	32	12	75	51
Total other segment income	141	104	260	237
Total segment gross operating margin	3,004	2,471	5,646	4,935
Other financial information:
Capital expenditures	1,158	1,299	2,141	2,361
Operating Segments | NGL Pipelines & Services
Segment revenues:
Revenues	23,921	20,410	44,501	42,827
Significant segment expenses:
Cost of sales	21,709	18,487	40,134	38,920
Variable operating costs and expenses	197	204	418	403
Fixed operating costs and expenses	504	442	981	865
Total significant segment expenses	22,410	19,133	41,533	40,188
Other segment income (expense):
Equity in income of unconsolidated affiliates	21	18	40	38
Other segment items	13	2	40	38
Total other segment income	34	20	80	76
Total segment gross operating margin	1,545	1,297	3,048	2,715
Other financial information:
Capital expenditures	539	825	1,031	1,460
Operating Segments | Crude Oil Pipelines & Services
Segment revenues:
Revenues	25,260	14,107	43,286	29,850
Significant segment expenses:
Cost of sales	24,717	13,660	42,323	28,967
Variable operating costs and expenses	42	34	79	69
Fixed operating costs and expenses	115	88	236	189
Total significant segment expenses	24,874	13,782	42,638	29,225
Other segment income (expense):
Equity in income of unconsolidated affiliates	86	72	140	144
Other segment items	13	6	26	8
Total other segment income	99	78	166	152
Total segment gross operating margin	485	403	814	777
Other financial information:
Capital expenditures	22	25	49	48
Operating Segments | Natural Gas Pipelines & Services
Segment revenues:
Revenues	892	1,273	2,351	2,726
Significant segment expenses:
Cost of sales	107	644	861	1,543
Variable operating costs and expenses	23	20	41	42
Fixed operating costs and expenses	210	195	402	372
Total significant segment expenses	340	859	1,304	1,957
Other segment income (expense):
Equity in income of unconsolidated affiliates	1	0	3	2
Other segment items	3	3	2	3
Total other segment income	4	3	5	5
Total segment gross operating margin	556	417	1,052	774
Other financial information:
Capital expenditures	479	327	819	630
Operating Segments | Petrochemical & Refined Products Services
Segment revenues:
Revenues	13,483	7,900	21,349	18,770
Significant segment expenses:
Cost of sales	12,620	7,159	19,753	17,315
Variable operating costs and expenses	140	107	272	213
Fixed operating costs and expenses	309	283	601	577
Total significant segment expenses	13,069	7,549	20,626	18,105
Other segment income (expense):
Equity in income of unconsolidated affiliates	1	2	2	2
Other segment items	3	1	7	2
Total other segment income	4	3	9	4
Total segment gross operating margin	418	354	732	669
Other financial information:
Capital expenditures	118	122	242	223
Operating Segments | Nonrelated Party
Segment revenues:
Revenues	18,255	11,352	32,625	26,756
Operating Segments | Nonrelated Party | NGL Pipelines & Services
Segment revenues:
Revenues	5,232	3,404	9,260	8,802
Operating Segments | Nonrelated Party | Crude Oil Pipelines & Services
Segment revenues:
Revenues	8,332	4,777	14,626	9,892
Operating Segments | Nonrelated Party | Natural Gas Pipelines & Services
Segment revenues:
Revenues	654	1,068	1,754	2,284
Operating Segments | Nonrelated Party | Petrochemical & Refined Products Services
Segment revenues:
Revenues	4,037	2,103	6,985	5,778
Operating Segments | Related parties
Segment revenues:
Revenues	14	11	30	24
Operating Segments | Related parties | NGL Pipelines & Services
Segment revenues:
Revenues	2	2	6	4
Operating Segments | Related parties | Crude Oil Pipelines & Services
Segment revenues:
Revenues	7	6	12	12
Operating Segments | Related parties | Natural Gas Pipelines & Services
Segment revenues:
Revenues	5	3	12	8
Operating Segments | Related parties | Petrochemical & Refined Products Services
Segment revenues:
Revenues	0	0	0	0
Intersegment Eliminations
Segment revenues:
Revenues	(45,287)	(32,327)	(78,832)	(67,393)
Intersegment Eliminations | NGL Pipelines & Services
Segment revenues:
Revenues	(18,687)	(17,004)	(35,235)	(34,021)
Intersegment Eliminations | Crude Oil Pipelines & Services
Segment revenues:
Revenues	(16,921)	(9,324)	(28,648)	(19,946)
Intersegment Eliminations | Natural Gas Pipelines & Services
Segment revenues:
Revenues	(233)	(202)	(585)	(434)
Intersegment Eliminations | Petrochemical & Refined Products Services
Segment revenues:
Revenues	$ (9,446)	$ (5,797)	$ (14,364)	$ (12,992)