Operating Segments and Geographic Data - Earnings by Major Operating Area (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	$ (8,270)	$ 4,305	$ (4,671)	$ 6,954
Operating Segments
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	(7,099)	4,212	(3,076)	7,587
Operating Segments | Upstream
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	(6,089)	3,483	(3,169)	6,606
Operating Segments | Upstream | United States
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	(2,066)	896	(1,825)	1,644
Operating Segments | Upstream | International
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	(4,023)	2,587	(1,344)	4,962
Operating Segments | Downstream
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	(1,010)	729	93	981
Operating Segments | Downstream | United States
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	(988)	465	(538)	682
Operating Segments | Downstream | International
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Chevron Corporation	(22)	264	631	299
All Other
Segment Reporting Information [Line Items]
Interest expense	(164)	(189)	(318)	(404)
Interest income	13	43	36	94
Other	$ (1,020)	$ 239	$ (1,313)	$ (323)