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Other Financial Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Gains on sale of nonstrategic properties $ 765,000,000 $ 1,500,000,000 $ 630,000,000
Goodwill 4,402,000,000 4,463,000,000  
Total financing interest and debt costs 735,000,000 817,000,000 921,000,000
Less: Capitalized interest 38,000,000 19,000,000 173,000,000
Interest and debt expense 697,000,000 798,000,000 748,000,000
Research and development expenses 435,000,000 500,000,000 453,000,000
Excess of replacement cost over the carrying value of inventories (LIFO method) 2,749,000,000 4,513,000,000 5,134,000,000
LIFO profits (losses) on inventory drawdowns included in earnings (147,000,000) (9,000,000) 26,000,000
Foreign currency effects (645,000,000) (304,000,000) 611,000,000
Company share of equity affiliates foreign currency effects (152,000,000) (28,000,000) 416,000,000
Downstream      
Business Acquisition [Line Items]      
Gains on sale of nonstrategic properties 30,000,000 50,000,000 365,000,000
Upstream      
Business Acquisition [Line Items]      
Gains on sale of nonstrategic properties 735,000,000 1,450,000,000 265,000,000
Gain (loss) for impairments and other assets write-offs 4,800,000,000 $ 10,400,000,000 $ 2,000,000,000
Unocal | Upstream      
Business Acquisition [Line Items]      
Goodwill 4,402,000,000    
Goodwill impairment loss $ 0