Revenue - Summary of Revenue from Contracts with Customers on a Disaggregated Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	$ 7,683	$ 4,094	$ 6,456
Other operating revenues	(210)	573	39
Total sales and other operating revenues	7,473	4,667	6,495
Gain (loss) on commodity derivatives	(243)	547	1
Crude Oil Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	4,325	2,363	3,660
Natural Gas Liquids Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	594	253	229
Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,015	631	829
Sales of Purchased Oil and Gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,749	847	1,738
Exploration and Production
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	7,473	4,667	6,495
Exploration and Production | Crude Oil Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	4,325	2,363	3,660
Exploration and Production | Natural Gas Liquids Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	594	253	229
Exploration and Production | Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,015	631	829
Exploration and Production | Sales of Purchased Oil and Gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,749	847	1,738
Exploration and Production | United States | Crude Oil Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	2,958	1,898	2,981
Exploration and Production | United States | Natural Gas Liquids Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	594	253	229
Exploration and Production | United States | Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	350	144	150
Exploration and Production | United States | Sales of Purchased Oil and Gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,638	831	1,644
Exploration and Production | Guyana | Crude Oil Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	765	278	0
Exploration and Production | Guyana | Natural Gas Liquids Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Exploration and Production | Guyana | Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Exploration and Production | Guyana | Sales of Purchased Oil and Gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	16	5	0
Exploration and Production | Malaysia and JDA | Crude Oil Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	83	34	113
Exploration and Production | Malaysia and JDA | Natural Gas Liquids Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Exploration and Production | Malaysia and JDA | Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	655	477	646
Exploration and Production | Malaysia and JDA | Sales of Purchased Oil and Gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	3
Exploration and Production | Other | Crude Oil Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	519	153	566
Exploration and Production | Other | Natural Gas Liquids Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Exploration and Production | Other | Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	10	10	33
Exploration and Production | Other | Sales of Purchased Oil and Gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	95	11	91
Midstream
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	0	0	0
Midstream | Crude Oil Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Midstream | Natural Gas Liquids Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Midstream | Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Midstream | Sales of Purchased Oil and Gas
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Operating Segments | United States
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	5,378	3,604	5,043
Operating Segments | Guyana
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	754	350	0
Operating Segments | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	738	511	762
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Total sales and other operating revenues	603	202	690
Operating Segments | Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	7,683	4,094	6,456
Other operating revenues	(210)	573	39
Total sales and other operating revenues	7,473	4,667	6,495
Operating Segments | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	5,540	3,126	5,004
Other operating revenues	(162)	478	39
Total sales and other operating revenues	5,378	3,604	5,043
Operating Segments | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	781	283	0
Other operating revenues	(27)	67	0
Total sales and other operating revenues	754	350	0
Operating Segments | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	738	511	762
Other operating revenues	0	0	0
Total sales and other operating revenues	738	511	762
Operating Segments | Exploration and Production | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	624	174	690
Other operating revenues	(21)	28	0
Total sales and other operating revenues	603	202	690
Operating Segments | Midstream
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,204	1,092	848
Other operating revenues	0	0	0
Total sales and other operating revenues	1,204	1,092	848
Eliminations
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	(1,204)	(1,092)	(848)
Other operating revenues	0	0	0
Total sales and other operating revenues	(1,204)	(1,092)	(848)
Eliminations | Exploration and Production
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Total sales and other operating revenues	0	0	0
Eliminations | Exploration and Production | United States
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Eliminations | Exploration and Production | Guyana
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Eliminations | Exploration and Production | Malaysia and JDA
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Eliminations | Exploration and Production | Other
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	0	0	0
Eliminations | Midstream
Disaggregation of Revenue [Line Items]
Total revenues from contracts with customers	1,204	1,092	848
Total sales and other operating revenues	$ 1,204	$ 1,092	$ 848