Revenue - Summary of Revenue from Contracts with Customers on a Disaggregated Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		$ 3,117		$ 5,516
Revenue from both contract with customer and not from contract with customer	$ 2,337		$ 4,779
Other operating revenues	(48)	(162)	(79)	(248)
Total revenues and non-operating income	2,289	2,955	4,700	5,268
Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		1,783		3,022
Revenue from both contract with customer and not from contract with customer	1,521		3,044
Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	112	173	253	354
Natural gas revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	220	346	454	626
Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	484	815	1,028	1,514
Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues and non-operating income	2,287	2,955	4,696	5,268
Exploration and Production | Crude oil revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		1,783		3,022
Revenue from both contract with customer and not from contract with customer	1,521		3,044
Exploration and Production | Crude oil revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	710	895	1,379	1,731
Exploration and Production | Crude oil revenue | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		681		907
Revenue from both contract with customer and not from contract with customer	787		1,612
Revenue not from contract with customer	88	0	196	0
Exploration and Production | Crude oil revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	24	37	53	68
Exploration and Production | Crude oil revenue | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	170	0	316
Exploration and Production | Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	112	173	253	354
Exploration and Production | Natural gas liquids revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	112	173	253	354
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	220	346	454	626
Exploration and Production | Natural gas revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	38	126	92	211
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	182	215	362	405
Exploration and Production | Natural gas revenue | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	5	0	10
Exploration and Production | Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	484	815	1,028	1,514
Exploration and Production | Sales of purchased oil and gas | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	469	761	996	1,421
Exploration and Production | Sales of purchased oil and gas | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	15	18	32	22
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	36	0	71
Midstream
Disaggregation of Revenue [Line Items]
Total revenues and non-operating income	2	0	4	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		3,117		5,516
Revenue from both contract with customer and not from contract with customer	2,337		4,779
Other operating revenues	(50)	(162)	(83)	(248)
Total revenues and non-operating income	2,287	2,955	4,696	5,268
Operating Segments | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	1,329	1,955	2,720	3,717
Other operating revenues	(30)	(95)	(56)	(153)
Total revenues and non-operating income	1,299	1,860	2,664	3,564
Operating Segments | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax		699		929
Revenue from both contract with customer and not from contract with customer	802		1,644
Other operating revenues	(20)	(52)	(27)	(67)
Total revenues and non-operating income	782	647	1,617	862
Operating Segments | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	206	252	415	473
Other operating revenues	0	0	0	0
Total revenues and non-operating income	206	252	415	473
Operating Segments | Exploration and Production | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	211	0	397
Other operating revenues	0	(15)	0	(28)
Total revenues and non-operating income	0	196	0	369
Operating Segments | Midstream
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	322	314	625	626
Other operating revenues	2	0	4	0
Total revenues and non-operating income	324	314	629	626
Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	(322)	(314)	(625)	(626)
Other operating revenues	0	0	0	0
Total revenues and non-operating income	(322)	(314)	(625)	(626)
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	322	314	625	626
Total revenues and non-operating income	$ 322	$ 314	$ 625	$ 626