Operating Segments and Geographic Data - Segment Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 47,216	$ 65,372	$ 96,058	$ 117,686
Oil and Gas
Segment Reporting Information [Line Items]
Sales and other operating revenues	47,216	65,372	96,058	117,686
Oil and Gas | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	58,408	79,914	117,831	144,193
Oil and Gas | All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	156	142	265	225
Oil and Gas | Total All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	36	38	66	54
Oil and Gas | United States | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	29,166	40,240	58,287	71,410
Oil and Gas | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(119)	(103)	(198)	(170)
Oil and Gas | United States | All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	156	141	264	224
Oil and Gas | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(8,272)	(9,921)	(15,818)	(17,906)
Oil and Gas | International | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	29,242	39,674	59,544	72,783
Oil and Gas | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(1)	(1)	(1)	(1)
Oil and Gas | International | All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	1	1	1
Oil and Gas | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(2,920)	(4,621)	(5,955)	(8,601)
Oil and Gas | Upstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	10,145	15,849	22,456	30,099
Oil and Gas | Upstream | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	18,631	28,462	39,450	53,280
Oil and Gas | Upstream | United States | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	8,755	14,232	18,378	25,548
Oil and Gas | Upstream | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(6,067)	(8,475)	(11,969)	(15,394)
Oil and Gas | Upstream | International | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	9,876	14,230	21,072	27,732
Oil and Gas | Upstream | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(2,419)	(4,138)	(5,025)	(7,787)
Oil and Gas | Downstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	37,035	49,485	73,536	87,533
Oil and Gas | Downstream | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	39,621	51,310	78,116	90,688
Oil and Gas | Downstream | United States | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	20,255	25,867	39,645	45,638
Oil and Gas | Downstream | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(2,086)	(1,343)	(3,651)	(2,342)
Oil and Gas | Downstream | International | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	19,366	25,443	38,471	45,050
Oil and Gas | Downstream | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ (500)	$ (482)	$ (929)	$ (813)