Disclosures About Segments And Related Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	$ 5,480	$ 2,730
Sales and other operating revenue	87,734	57,552
Sakhalin -1 [Member]
Segment Reporting Information [Line Items]
Largely impairment charges, after-tax	3,400
Upstream United States [Member]
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	2,376	363
Sales and other operating revenue	2,656	1,885
Intersegment Revenue	6,191	3,323
Upstream Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	2,112	2,191
Sales and other operating revenue	6,343	3,094
Intersegment Revenue	10,835	6,817
Upstream Non-U.S. [Member] | Sakhalin -1 [Member]
Segment Reporting Information [Line Items]
Largely impairment charges, after-tax	3,300
Downstream United States [Member]
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	685	(113)
Sales and other operating revenue	25,356	16,078
Intersegment Revenue	8,261	3,953
Downstream Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	(353)	(277)
Sales and other operating revenue	43,609	28,613
Intersegment Revenue	9,503	5,381
Chemical United States [Member]
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	819	715
Sales and other operating revenue	3,982	3,091
Intersegment Revenue	2,863	1,950
Chemical Non-U.S. [Member]
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	535	700
Sales and other operating revenue	5,781	4,887
Intersegment Revenue	2,213	1,231
Corporate And Financing [Member]
Segment Reporting Information [Line Items]
Earnings (Loss) after income tax	(694)	(849)
Sales and other operating revenue	7	(96)
Intersegment Revenue	57	$ 57
Corporate And Financing [Member] | Sakhalin -1 [Member]
Segment Reporting Information [Line Items]
Largely impairment charges, after-tax	$ 100