Segment Information - Schedule of Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Selected Information [Line Items]
Operating Revenues and Other	$ 6,212	$ 7,593	$ 17,829	$ 18,983
Operating Income (Loss)	2,557	3,664	7,099	7,113
Other Income, Net	52	40	168	66
Interest Expense, Net	(36)	(41)	(113)	(137)
Income Before Income Taxes	2,573	3,663	7,154	7,042
Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	6,212	7,593	17,829	18,983
Operating Income (Loss)	2,557	3,664	7,099	7,113
Segment Reconciling Items
Selected Information [Line Items]
Other Income, Net	52	40	168	66
Interest Expense, Net	(36)	(41)	(113)	(137)
United States | Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	6,164	7,481	17,625	18,733
Operating Income (Loss)	2,559	3,606	7,032	7,010
Trinidad | Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	48	111	203	249
Operating Income (Loss)	17	73	99	132
Other International
Selected Information [Line Items]
Pretax impairment charges for proved oil and gas properties and other property, plant and equipment	14	10	18	12
Other International | Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	0	1	1	1
Operating Income (Loss)	$ (19)	$ (15)	$ (32)	$ (29)