Revenue - Summary of Revenue from Contracts with Customers on a Disaggregated Basis (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		$ 3,287		$ 8,803
Revenue from both contract with customer and not from contract with customer	$ 2,853		$ 7,632
Other operating revenues	(53)	(165)	(132)	(413)
Total revenues and non-operating income	2,800	3,122	7,500	8,390
Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		1,864		4,886
Revenue from both contract with customer and not from contract with customer	1,793		4,837
Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	133	191	386	545
Natural gas revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	267	301	721	927
Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	660	931	1,688	2,445
Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues and non-operating income	2,798	3,122	7,494	8,390
Exploration and Production | Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		1,864		4,886
Revenue from both contract with customer and not from contract with customer	1,793		4,837
Exploration and Production | Crude oil revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	861	895	2,240	2,626
Exploration and Production | Crude oil revenue | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		838		1,745
Revenue from both contract with customer and not from contract with customer	896		2,508
Revenue not from contract with customer	112	56	308	56
Exploration and Production | Crude oil revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	36	34	89	102
Exploration and Production | Crude oil revenue | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	97	0	413
Exploration and Production | Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	133	191	386	545
Exploration and Production | Natural gas liquids revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	133	191	386	545
Exploration and Production | Natural gas liquids revenue | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Exploration and Production | Natural gas liquids revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Exploration and Production | Natural gas liquids revenue | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Exploration and Production | Natural gas revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	267	301	721	927
Exploration and Production | Natural gas revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	44	145	136	356
Exploration and Production | Natural gas revenue | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Exploration and Production | Natural gas revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	223	150	585	555
Exploration and Production | Natural gas revenue | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	6	0	16
Exploration and Production | Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	660	931	1,688	2,445
Exploration and Production | Sales of purchased oil and gas | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	640	889	1,636	2,310
Exploration and Production | Sales of purchased oil and gas | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	20	20	52	42
Exploration and Production | Sales of purchased oil and gas | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Exploration and Production | Sales of purchased oil and gas | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	22	0	93
Midstream
Disaggregation of Revenue [Line Items]
Total revenues and non-operating income	2	0	6	0
Midstream | Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Midstream | Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Midstream | Natural gas revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Midstream | Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		3,287		8,803
Revenue from both contract with customer and not from contract with customer	2,853		7,632
Other operating revenues	(55)	(165)	(138)	(413)
Total revenues and non-operating income	2,798	3,122	7,494	8,390
Operating Segments | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	1,678	2,120	4,398	5,837
Other operating revenues	(27)	(98)	(83)	(251)
Total revenues and non-operating income	1,651	2,022	4,315	5,586
Operating Segments | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		858		1,787
Revenue from both contract with customer and not from contract with customer	916		2,560
Other operating revenues	(17)	(59)	(44)	(126)
Total revenues and non-operating income	899	799	2,516	1,661
Operating Segments | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	259	184	674	657
Other operating revenues	(11)	0	(11)	0
Total revenues and non-operating income	248	184	663	657
Operating Segments | Exploration and Production | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	125	0	522
Other operating revenues	0	(8)	0	(36)
Total revenues and non-operating income	0	117	0	486
Operating Segments | Midstream
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	361	335	986	961
Other operating revenues	2	0	6	0
Total revenues and non-operating income	363	335	992	961
Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	(361)	(335)	(986)	(961)
Other operating revenues	0	0	0	0
Total revenues and non-operating income	(361)	(335)	(986)	(961)
Eliminations | Exploration and Production
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Total revenues and non-operating income	0	0	0	0
Eliminations | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Eliminations | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Eliminations | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Eliminations | Exploration and Production | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Eliminations | Midstream
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	361	335	986	961
Total revenues and non-operating income	$ 361	$ 335	$ 986	$ 961