Segment Information - Financial Information by Major Geographic Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 7,473	$ 4,667	$ 6,495
Property, Plant and Equipment— Net	14,182	14,115
Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	7,473	4,667	6,495
Property, Plant and Equipment— Net	6,596	7,273
Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	0	0
Property, Plant and Equipment— Net	3,125	3,111
Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	7,473	4,667	6,495
Operating Segments | Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,204	1,092	848
Corporate, Interest and Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	0	0
Property, Plant and Equipment— Net	10	11
United States | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,378	3,604	5,043
Property, Plant and Equipment— Net	9,721	10,384
United States | Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,378	3,604	5,043
Guyana | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	754	350	0
Property, Plant and Equipment— Net	3,064	2,114
Guyana | Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	754	350	0
Malaysia and JDA | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	738	511	762
Property, Plant and Equipment— Net	1,035	1,067
Malaysia and JDA | Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	738	511	762
Other | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	603	202	690
Property, Plant and Equipment— Net	352	539
Other | Operating Segments | Exploration and Production
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 603	$ 202	$ 690