Revenue - Summary of Revenue from Contracts with Customers on a Disaggregated Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ 3,117	$ 1,646	$ 5,516	$ 3,593
Other operating revenues	(162)	(67)	(248)	(116)
Total sales and other operating revenues	2,955	1,579	5,268	3,477
Crude oil revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,783	957	3,022	2,161
Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	173	120	354	263
Natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	346	240	626	519
Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	815	329	1,514	650
Exploration and Production
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	2,955	1,579	5,268	3,477
Exploration and Production | Crude oil revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,783	957	3,022	2,161
Exploration and Production | Crude oil revenue | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	895	661	1,731	1,546
Exploration and Production | Crude oil revenue | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	681	134	907	315
Exploration and Production | Crude oil revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	37	27	68	49
Exploration and Production | Crude oil revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	170	135	316	251
Exploration and Production | Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	173	120	354	263
Exploration and Production | Natural gas liquids revenue | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	173	120	354	263
Exploration and Production | Natural gas liquids revenue | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Exploration and Production | Natural gas liquids revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Exploration and Production | Natural gas liquids revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Exploration and Production | Natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	346	240	626	519
Exploration and Production | Natural gas revenue | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	126	61	211	174
Exploration and Production | Natural gas revenue | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Exploration and Production | Natural gas revenue | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	215	178	405	341
Exploration and Production | Natural gas revenue | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	5	1	10	4
Exploration and Production | Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	815	329	1,514	650
Exploration and Production | Sales of purchased oil and gas | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	761	299	1,421	597
Exploration and Production | Sales of purchased oil and gas | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	18	4	22	8
Exploration and Production | Sales of purchased oil and gas | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Exploration and Production | Sales of purchased oil and gas | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	36	26	71	45
Midstream
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	0	0	0	0
Midstream | Crude oil revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Midstream | Natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Midstream | Natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Midstream | Sales of purchased oil and gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	3,117	1,646	5,516	3,593
Other operating revenues	(162)	(67)	(248)	(116)
Total sales and other operating revenues	2,955	1,579	5,268	3,477
Operating Segments | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,955	1,141	3,717	2,580
Other operating revenues	(95)	(53)	(153)	(94)
Total sales and other operating revenues	1,860	1,088	3,564	2,486
Operating Segments | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	699	138	929	323
Other operating revenues	(52)	(6)	(67)	(10)
Total sales and other operating revenues	647	132	862	313
Operating Segments | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	252	205	473	390
Other operating revenues	0	0	0	0
Total sales and other operating revenues	252	205	473	390
Operating Segments | Exploration and Production | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	211	162	397	300
Other operating revenues	(15)	(8)	(28)	(12)
Total sales and other operating revenues	196	154	369	288
Operating Segments | Midstream
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	314	294	626	583
Other operating revenues	0	0	0	0
Total sales and other operating revenues	314	294	626	583
Eliminations
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	(314)	(294)	(626)	(583)
Other operating revenues	0	0	0	0
Total sales and other operating revenues	(314)	(294)	(626)	(583)
Eliminations | Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Total sales and other operating revenues	0	0	0	0
Eliminations | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Eliminations | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Eliminations | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Eliminations | Exploration and Production | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0	0
Eliminations | Midstream
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	314	294	626	583
Total sales and other operating revenues	$ 314	$ 294	$ 626	$ 583