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Operating Segments and Geographic Data - Earnings by Major Operating Area (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation $ 6,111 $ (207) $ 10,570 $ (4,878)
Operating Segments        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 6,445 527 12,817 (2,549)
Operating Segments | Upstream        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 5,135 235 10,663 (2,934)
Operating Segments | Upstream | United States        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 1,962 116 4,349 (1,709)
Operating Segments | Upstream | International        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 3,173 119 6,314 (1,225)
Operating Segments | Downstream        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 1,310 292 2,154 385
Operating Segments | Downstream | United States        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 1,083 141 1,729 (397)
Operating Segments | Downstream | International        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 227 151 425 782
All Other        
Segment Reporting Information [Line Items]        
Interest expense (160) (153) (517) (471)
Interest income 8 7 28 43
Other $ (182) $ (588) $ (1,758) $ (1,901)