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Investments and Advances - Summary of Financial Information of All Equity Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]        
Total revenues $ 94,692 $ 146,516 $ 166,339  
Income before income tax expense (7,453) 5,536 20,575  
Net Income (Loss) (5,561) 2,845 14,860  
Current assets 26,078 28,329    
Current liabilities 22,183 26,530    
Total affiliates’ net equity 132,726 145,208 155,642 $ 149,319
Chevron | Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Schedule of Investments [Line Items]        
Total revenues 21,641 32,628 40,679  
Income before income tax expense 2,550 5,954 6,755  
Net Income (Loss) 2,034 4,366 6,384  
Current assets 7,328 12,998 12,813  
Noncurrent assets 43,247 41,531 36,369  
Current liabilities 5,052 10,610 9,843  
Noncurrent liabilities 5,884 5,068 4,446  
Total affiliates’ net equity 39,639 38,851 34,893  
Affiliates | Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Schedule of Investments [Line Items]        
Total revenues 49,093 66,473 84,469  
Income before income tax expense 5,682 13,197 16,693  
Net Income (Loss) 4,704 9,809 13,321  
Current assets 17,087 30,791 32,657  
Noncurrent assets 97,468 97,177 87,614  
Current liabilities 12,164 26,032 26,006  
Noncurrent liabilities 25,586 21,593 20,000  
Total affiliates’ net equity $ 76,805 $ 80,343 $ 74,265