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Summarized Financial Data - Chevron U.S.A. Inc. - Schedule of Summarized Financial Data - Chevron U.S.A. Inc. (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Subsidiary Statements Captions [Line Items]        
Sales and other operating revenues $ 67,199 $ 44,375 $ 114,755 $ 90,476
Costs and other deductions 53,371 40,675 98,032 82,702
Net income (loss) attributable to CUSA $ 12,072 $ 2,490 14,282 5,990
Chevron U.S.A. Inc.        
Subsidiary Statements Captions [Line Items]        
Sales and other operating revenues     92,655 70,908
Costs and other deductions     87,034 67,891
Net income (loss) attributable to CUSA     $ 4,692 $ 2,553