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Income And Other Taxes (Reconciliation Between Income Tax Expense And Theoretical U.S. Tax) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income and Other Taxes [Line Items]      
United States income (loss) before income taxes $ 11,000 $ 12,258 $ 14,786
Non-U.S. income (loss) before income taxes 30,268 36,615 37,997
Income (loss) before income taxes 41,268 48,873 52,783
U.S. federal statutory theoretical tax $ 8,666 $ 10,263 $ 11,084
U.S. federal statutory theoretical tax (percent) 21.00% 21.00% 21.00%
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax   $ 4,986 $ 5,888
Effect of equity method of accounting   (1,301) (1,341)
Other   (452) (259)
State taxes, net of federal tax benefit $ (76) 314 57
State taxes, net of federal tax benefit (percent) 0.00%    
Total income tax expense (benefit) $ 11,504 13,810 15,429
Total income tax expense (credit) (percent) 28.00%    
ExxonMobil share of equity company income taxes $ 2,046 3,197 3,058
Total income tax expense (credit) 13,550 17,007 18,487
Net income (loss) including noncontrolling interests 29,764 35,063 37,354
Total income (loss) before taxes $ 43,314 $ 52,070 $ 55,841
Effective income tax rate 31.00% 33.00% 33.00%
Foreign Tax Jurisdiction      
Income and Other Taxes [Line Items]      
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax $ 4,212    
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax (percent) 10.00%    
United Arab Emirates      
Income and Other Taxes [Line Items]      
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax $ 3,405    
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax (percent) 8.00%    
Qatar      
Income and Other Taxes [Line Items]      
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax $ (552)    
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax (percent) (1.00%)    
Effect of equity method of accounting $ (620)    
Effect of equity method of accounting (percent) (2.00%)    
Other $ 68    
Other (percent) 0.00%    
All Other Countries      
Income and Other Taxes [Line Items]      
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax $ 1,359    
Non-U.S. taxes in excess of/(less than) theoretical U.S. tax (percent) 3.00%    
United States      
Income and Other Taxes [Line Items]      
Other $ (1,298)    
Other (percent) (3.00%)