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Summarized Financial Data - Chevron U.S.A. Inc. - Summary of Income Statement Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsidiary Statements Captions [Line Items]      
Sales and other operating revenues $ 94,471 $ 139,865 $ 158,902
Total costs and other deductions 102,145 140,980 145,764
Net Income (Loss) Attributable to Chevron Corporation (5,543) 2,924 14,824
Chevron U.S.A. Inc.      
Subsidiary Statements Captions [Line Items]      
Sales and other operating revenues 67,950 109,314 125,076
Total costs and other deductions 72,575 116,365 121,351
Net Income (Loss) Attributable to Chevron Corporation $ (2,676) $ (5,061) $ 4,334