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Summarized Financial Data - Chevron U.S.A. Inc. - Income Statement (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Sales and other operating revenues $ 31,076 $ 29,705
Costs and other deductions 29,852 27,356
Net income attributable to equity method investee 1,377 3,599
Chevron U.S.A. Inc.    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Sales and other operating revenues 23,479 22,039
Costs and other deductions 23,322 21,281
Net income attributable to equity method investee $ 257 $ 860