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Summarized Financial Data - Chevron U.S.A. Inc. - Income Statement (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Sales and other operating revenues $ 42,552 $ 23,997 $ 109,745 $ 69,628
Costs and other deductions 36,655 24,495 99,682 75,942
Net income attributable to equity method investee $ 6,111 $ (207) 10,570 (4,878)
Chevron U.S.A. Inc.        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Sales and other operating revenues     85,002 50,360
Costs and other deductions     81,553 54,221
Net income attributable to equity method investee     $ 4,184 $ (2,203)