Segment Information - Schedule of Selected Financial Information by Reportable Segment (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
Selected Information [Line Items]
Gains (Losses) on Asset Dispositions, Net	$ (18)	$ (7)	$ (19)	$ 39
Operating Revenues and Other	5,847	5,965	16,994	18,113
Lease and Well	431	392	1,228	1,178
Gathering, Processing and Transportation Costs	587	445	1,482	1,281
Marketing Costs	1,134	1,500	3,675	4,394
Depreciation, Depletion and Amortization	1,169	1,031	3,235	3,089
General and Administrative	239	167	596	480
Taxes Other Than Income	309	283	951	958
Operating Income (Loss)	1,836	2,089	5,442	6,490
Interest Income	57	76	181	208
Other Income (Expense)	2	0	(2)	(4)
Interest Expense, Net	(71)	(31)	(169)	(100)
Income Before Income Taxes	1,824	2,134	5,452	6,594
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	8,128	1,280	11,174	4,205
Total Property, Plant and Equipment, Net	42,585	34,126	42,585	34,126	$ 34,212
Total Assets	52,199	46,151	52,199	46,151	$ 47,186
Encino
Selected Information [Line Items]
Properties acquired	6,633		6,633
Crude Oil and Condensate
Selected Information [Line Items]
Revenue from contract with customer	3,243	3,488	9,510	10,660
NGLs
Selected Information [Line Items]
Revenue from contract with customer	604	524	1,710	1,552
Natural Gas
Selected Information [Line Items]
Revenue from contract with customer	707	372	1,944	1,057
Gains On Mark-To-Market Financial Commodity and Other Derivative Contracts, Net
Selected Information [Line Items]
Revenue not from contract with customer	116	79	32	269
Gathering, Processing and Marketing
Selected Information [Line Items]
Revenue from contract with customer	1,178	1,481	3,765	4,459
Other, Net
Selected Information [Line Items]
Revenue not from contract with customer	17	28	52	77
United States
Selected Information [Line Items]
Gains (Losses) on Asset Dispositions, Net	(18)	(8)	(18)	44
Operating Revenues and Other	5,754	5,881	16,722	17,897
Lease and Well	413	380	1,181	1,147
Gathering, Processing and Transportation Costs	587	445	1,481	1,281
Marketing Costs	1,134	1,500	3,675	4,394
Depreciation, Depletion and Amortization	1,134	996	3,113	2,987
General and Administrative	232	162	572	465
Taxes Other Than Income	307	281	947	955
Other Segment Items	113	54	274	194
Operating Income (Loss)	1,834	2,063	5,479	6,474
Interest Income	53	71	169	192
Interest Expense, Net	(71)	(31)	(169)	(100)
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	8,046	1,246	11,030	4,089
Total Property, Plant and Equipment, Net	42,024	33,683	42,024	33,683
Total Assets	50,783	44,867	50,783	44,867
United States | Crude Oil and Condensate
Selected Information [Line Items]
Revenue from contract with customer	3,234	3,482	9,489	10,646
United States | NGLs
Selected Information [Line Items]
Revenue from contract with customer	604	524	1,710	1,552
United States | Natural Gas
Selected Information [Line Items]
Revenue from contract with customer	626	296	1,696	852
United States | Gains On Mark-To-Market Financial Commodity and Other Derivative Contracts, Net
Selected Information [Line Items]
Revenue not from contract with customer	116	79	32	269
United States | Gathering, Processing and Marketing
Selected Information [Line Items]
Revenue from contract with customer	1,175	1,481	3,761	4,458
United States | Other, Net
Selected Information [Line Items]
Revenue not from contract with customer	17	27	52	76
Trinidad
Selected Information [Line Items]
Gains (Losses) on Asset Dispositions, Net	0	1	0	(5)
Operating Revenues and Other	92	84	272	216
Lease and Well	13	12	37	31
Gathering, Processing and Transportation Costs	0	0	1	0
Marketing Costs	0	0	0	0
Depreciation, Depletion and Amortization	35	35	122	101
General and Administrative	5	4	13	11
Taxes Other Than Income	1	1	3	2
Other Segment Items	21	2	61	9
Operating Income (Loss)	17	30	35	62
Interest Income	3	4	8	12
Interest Expense, Net	0	0	0	0
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	48	31	107	112
Total Property, Plant and Equipment, Net	499	422	499	422
Total Assets	1,145	1,094	1,145	1,094
Trinidad | Crude Oil and Condensate
Selected Information [Line Items]
Revenue from contract with customer	9	6	21	14
Trinidad | NGLs
Selected Information [Line Items]
Revenue from contract with customer	0	0	0	0
Trinidad | Natural Gas
Selected Information [Line Items]
Revenue from contract with customer	80	76	247	205
Trinidad | Gains On Mark-To-Market Financial Commodity and Other Derivative Contracts, Net
Selected Information [Line Items]
Revenue not from contract with customer	0	0	0	0
Trinidad | Gathering, Processing and Marketing
Selected Information [Line Items]
Revenue from contract with customer	3	0	4	1
Trinidad | Other, Net
Selected Information [Line Items]
Revenue not from contract with customer	0	1	0	1
Other International
Selected Information [Line Items]
Gains (Losses) on Asset Dispositions, Net	0	0	(1)	0
Operating Revenues and Other	1	0	0	0
Lease and Well	5	0	10	0
Gathering, Processing and Transportation Costs	0	0	0	0
Marketing Costs	0	0	0	0
Depreciation, Depletion and Amortization	0	0	0	1
General and Administrative	2	1	11	4
Taxes Other Than Income	1	1	1	1
Other Segment Items	8	2	50	40
Operating Income (Loss)	(15)	(4)	(72)	(46)
Interest Income	1	1	4	4
Interest Expense, Net	0	0	0	0
Additions to Oil and Gas Properties, Excluding Dry Hole Costs	34	3	37	4
Total Property, Plant and Equipment, Net	62	21	62	21
Total Assets	271	190	271	190
Other International | Crude Oil and Condensate
Selected Information [Line Items]
Revenue from contract with customer	0	0	0	0
Other International | NGLs
Selected Information [Line Items]
Revenue from contract with customer	0	0	0	0
Other International | Natural Gas
Selected Information [Line Items]
Revenue from contract with customer	1	0	1	0
Other International | Gains On Mark-To-Market Financial Commodity and Other Derivative Contracts, Net
Selected Information [Line Items]
Revenue not from contract with customer	0	0	0	0
Other International | Gathering, Processing and Marketing
Selected Information [Line Items]
Revenue from contract with customer	0	0	0	0
Other International | Other, Net
Selected Information [Line Items]
Revenue not from contract with customer	$ 0	$ 0	$ 0	$ 0