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Operating Segments and Geographic Data - Segment Earnings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation $ 14,824 $ 9,195 $ (497)
Operating Segments      
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation 17,114 13,364 898
Operating Segments | Upstream      
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation 13,316 8,150 (2,537)
Operating Segments | Upstream | United States      
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation 3,278 3,640 (2,054)
Operating Segments | Upstream | International      
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation 10,038 4,510 (483)
Operating Segments | Downstream      
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation 3,798 5,214 3,435
Operating Segments | Downstream | United States      
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation 2,103 2,938 1,307
Operating Segments | Downstream | International      
Segment Reporting Information [Line Items]      
Net Income (Loss) Attributable to Chevron Corporation 1,695 2,276 2,128
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Interest expense (713) (264) (168)
Interest income 137 60 58
Other $ (1,714) $ (3,965) $ (1,285)