Segment Information - Segment Financial Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information
Total revenues	$ 11,578	$ 12,456	$ 33,698	$ 36,854
Purchases and related costs	(10,585)	(11,540)	(30,862)	(34,086)
Field operating costs	(288)	(408)	(873)	(962)
Segment general and administrative expenses	(83)	(86)	(251)	(246)
Total significant segment expenses	(10,956)	(12,034)	(31,986)	(35,294)
Equity earnings in unconsolidated entities	96	97	292	298
Total other segment items	(135)	43	(295)	(177)
Segment Adjusted EBITDA	583	562	1,709	1,681
Investment and acquisition capital expenditures	305	106	1,308	367
Maintenance capital expenditures	36	50	112	140
Investments in unconsolidated entities	2,873		2,873		$ 2,811
Product sales revenues
Segment Reporting Information
Total revenues	11,150	12,021	32,389	35,606
Services
Segment Reporting Information
Total revenues	428	435	1,309	1,248
Operating Segments
Segment Reporting Information
Total revenues	11,583	12,464	33,712	36,867
Operating Segments | Crude Oil
Segment Reporting Information
Total revenues	11,559	12,444	33,620	36,761
Purchases and related costs	(10,572)	(11,529)	(30,802)	(34,014)
Field operating costs	(281)	(400)	(853)	(938)
Segment general and administrative expenses	(74)	(78)	(229)	(223)
Total significant segment expenses	(10,927)	(12,007)	(31,884)	(35,175)
Equity earnings in unconsolidated entities	96	97	292	298
Depreciation and amortization of unconsolidated entities	21	22	62	59
Derivative activities and inventory valuation adjustments	(30)	(13)	(2)	20
Long-term inventory costing adjustments	10	34	27	10
Deficiencies under minimum volume commitments, net	(6)	15	(21)	10
Equity-indexed compensation expense	10	9	28	28
Foreign currency revaluation	(3)	2	6	(18)
Transaction-related expenses			7
Segment amounts attributable to noncontrolling interests	(137)	(146)	(402)	(406)
Total other segment items	(135)	43	(295)	(177)
Segment Adjusted EBITDA	593	577	1,733	1,707
Investment and acquisition capital expenditures	305	106	1,308	367
Maintenance capital expenditures	36	48	110	135
Investments in unconsolidated entities	2,873		2,873		$ 2,811
Operating Segments | Crude Oil | Line 901 Incident
Segment Reporting Information
Line 901 incident		120		120
Operating Segments | NGL
Segment Reporting Information
Total revenues	24	20	92	106
Purchases and related costs	(18)	(19)	(74)	(85)
Field operating costs	(7)	(8)	(20)	(24)
Segment general and administrative expenses	(9)	(8)	(22)	(23)
Total significant segment expenses	(34)	(35)	(116)	(132)
Transaction-related expenses			0
Total other segment items	0		0	0
Segment Adjusted EBITDA	(10)	(15)	(24)	(26)
Investment and acquisition capital expenditures	0	0	0	0
Maintenance capital expenditures		2	2	5
Operating Segments | Product sales revenues | Crude Oil
Segment Reporting Information
Total revenues	11,132	12,009	32,313	35,515
Operating Segments | Product sales revenues | NGL
Segment Reporting Information
Total revenues	22	19	88	103
Operating Segments | Services | Crude Oil
Segment Reporting Information
Total revenues	427	435	1,307	1,246
Operating Segments | Services | NGL
Segment Reporting Information
Total revenues	2	1	4	3
Intersegment revenues elimination
Segment Reporting Information
Total revenues	(5)	(8)	(14)	(13)
Purchases and related costs	5	8	14	13
Total significant segment expenses	5	8	14	13
Intersegment revenues elimination | Product sales revenues
Segment Reporting Information
Total revenues	(4)	(7)	(12)	(12)
Intersegment revenues elimination | Services
Segment Reporting Information
Total revenues	$ (1)	$ (1)	$ (2)	$ (1)