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Operating Segments and Geographic Data - Earnings by Major Operating Area (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation $ 3,082 $ (8,270) $ 4,459 $ (4,671)
Operating Segments        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 4,017 (7,099) 6,372 (3,076)
Operating Segments | Upstream        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 3,178 (6,089) 5,528 (3,169)
Operating Segments | Upstream | United States        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 1,446 (2,066) 2,387 (1,825)
Operating Segments | Upstream | International        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 1,732 (4,023) 3,141 (1,344)
Operating Segments | Downstream        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 839 (1,010) 844 93
Operating Segments | Downstream | United States        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 776 (988) 646 (538)
Operating Segments | Downstream | International        
Segment Reporting Information [Line Items]        
Net Income (Loss) Attributable to Chevron Corporation 63 (22) 198 631
All Other        
Segment Reporting Information [Line Items]        
Interest expense (173) (164) (357) (318)
Interest income 12 13 20 36
Other $ (774) $ (1,020) $ (1,576) $ (1,313)