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Summarized Financial Data - Chevron U.S.A. Inc. - Income Statement Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Subsidiary Statements Captions [Line Items]      
Sales and other operating revenues $ 184,432 $ 193,414 $ 196,913
Total costs and other deductions 169,288 175,286 171,365
Net income (loss) attributable to CUSA 12,299 17,661 21,369
Chevron U.S.A. Inc.      
Subsidiary Statements Captions [Line Items]      
Sales and other operating revenues 142,048 149,925 152,347
Total costs and other deductions 136,059 145,582 144,482
Net income (loss) attributable to CUSA $ 5,197 $ 4,151 $ 4,598