Segment Disclosures and Related Information - Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	$ 14,811	$ 17,762
Lower 48
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	10,049	11,557
Canada
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	1,183	1,520
Intersegment eliminations | Lower 48
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	(4)	(7)
Intersegment eliminations | Canada
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	(340)	(651)
Operating Segments
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	14,811	17,762
Operating Segments | Alaska
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	1,735	1,918
Operating Segments | Lower 48
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	10,045	11,550
Operating Segments | Canada
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	843	869
Operating Segments | Europe, Middle East and North Africa
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	1,702	2,589
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	464	750
Operating Segments | Other International
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	0	0
Corporate and Other
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	22	86
United States
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	11,802	13,553
Canada
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	843	869
China
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	202	273
Indonesia
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	0	159
Libya
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	370	431
Malaysia
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	261	318
Norway
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	651	932
United Kingdom
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	681	1,226
Other foreign countries
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	1	1
Natural gas
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	4,412	5,998
Natural gas liquids
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	695	879
Crude oil
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	8,904	9,870
Other
Segment Reporting Information [Line Items]
Consolidated sales and other operating revenues	$ 800	$ 1,015