Revenue - Summary of Revenue from Contracts with Customers on a Disaggregated Basis (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue from both contract with customer and not from contract with customer	$ 2,911	$ 3,308
Other operating revenues	1	1
Total revenues and non-operating income	2,912	3,309
Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from both contract with customer and not from contract with customer	1,898	2,328
Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	171	153
Natural gas revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	255	259
Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	580	563
Third-party services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	7	5
Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues and non-operating income	2,904	3,303
Exploration and Production | Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from both contract with customer and not from contract with customer	1,898	2,328
Exploration and Production | Crude oil revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	745	789
Exploration and Production | Crude oil revenue | Guyana
Disaggregation of Revenue [Line Items]
Revenue from both contract with customer and not from contract with customer	1,149	1,510
Revenue not from contract with customer	133	252
Exploration and Production | Crude oil revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	4	29
Exploration and Production | Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	171	153
Exploration and Production | Natural gas liquids revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	171	153
Exploration and Production | Natural gas liquids revenue | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	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
Exploration and Production | Natural gas revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	255	259
Exploration and Production | Natural gas revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	73	48
Exploration and Production | Natural gas revenue | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Exploration and Production | Natural gas revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	182	211
Exploration and Production | Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	580	563
Exploration and Production | Sales of purchased oil and gas | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	556	533
Exploration and Production | Sales of purchased oil and gas | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	24	30
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
Exploration and Production | Third-party services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Exploration and Production | Third-party services | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Exploration and Production | Third-party services | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Exploration and Production | Third-party services | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Midstream
Disaggregation of Revenue [Line Items]
Total revenues and non-operating income	8	6
Midstream | Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Midstream | Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Midstream | Natural gas revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Midstream | Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Midstream | Third-party services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	7	5
Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Revenue from both contract with customer and not from contract with customer	2,904	3,303
Other operating revenues	0	0
Total revenues and non-operating income	2,904	3,303
Operating Segments | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	1,545	1,523
Other operating revenues	0	0
Total revenues and non-operating income	1,545	1,523
Operating Segments | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Revenue from both contract with customer and not from contract with customer	1,173	1,540
Other operating revenues	0	0
Total revenues and non-operating income	1,173	1,540
Operating Segments | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	186	240
Other operating revenues	0	0
Total revenues and non-operating income	186	240
Operating Segments | Midstream
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	381	355
Other operating revenues	1	1
Total revenues and non-operating income	382	356
Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	(374)	(350)
Other operating revenues	0	0
Total revenues and non-operating income	(374)	(350)
Eliminations | Exploration and Production
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Total revenues and non-operating income	0	0
Eliminations | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Eliminations | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Eliminations | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0
Eliminations | Midstream
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	374	350
Total revenues and non-operating income	$ 374	$ 350