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Investments and Advances - Summary of Financial Information of All Equity Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]        
Total revenues $ 202,792 $ 200,949 $ 246,252  
Income before income tax expense 27,506 29,584 49,674  
Net income attributable to TCO 17,749 21,411 35,608  
Current assets 40,911 41,128    
Current liabilities 38,558 32,258    
Total affiliates’ net equity 153,157 161,929 160,242 $ 139,940
Income tax expense (benefit) 9,757 8,173 14,066  
Chevron | Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Schedule of Investments [Line Items]        
Total revenues 21,765 23,217 48,323  
Income before income tax expense 6,088 7,209 10,876  
Net income attributable to TCO 4,802 5,485 8,595  
Current assets 9,323 10,110 11,671  
Noncurrent assets 49,435 48,753 46,428  
Current liabilities 5,084 6,698 7,708  
Noncurrent liabilities 7,278 6,342 5,980  
Total affiliates’ net equity 46,396 45,823 44,411  
Income tax expense (benefit) 1,286      
Affiliates | Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Schedule of Investments [Line Items]        
Total revenues 46,081 49,306 100,184  
Income before income tax expense 13,127 15,304 23,811  
Net income attributable to TCO 10,253 11,618 19,077  
Current assets 21,697 22,772 26,632  
Noncurrent assets 104,396 105,965 101,557  
Current liabilities 12,906 14,085 16,319  
Noncurrent liabilities 22,651 23,797 22,943  
Total affiliates’ net equity 90,536 $ 90,855 $ 88,927  
Income tax expense (benefit) $ 2,874