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Summarized Financial Data - Chevron U.S.A. Inc. - Income Statement (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Subsidiary Statements Captions [Line Items]    
Sales and other operating revenues $ 46,101 $ 46,580
Costs and other deductions 42,027 40,794
Net income (loss) attributable to CUSA 3,500 5,501
Chevron U.S.A. Inc.    
Subsidiary Statements Captions [Line Items]    
Sales and other operating revenues 34,983 36,490
Costs and other deductions 33,683 34,947
Net income (loss) attributable to CUSA $ 1,111 $ 1,392