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Taxes - Effective Income Tax Reconcilliation and Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (loss) before income taxes      
United States $ 4,730 $ (441) $ (4,317)
International 15,845 9,662 2,157
Income (Loss) Before Income Tax Expense 20,575 9,221 (2,160)
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Theoretical tax (at U.S. statutory rate of 21% - 2018, 35% - 2017 & 2016) 4,321 3,227 (756)
Effect of U.S. tax reform (26) (2,020) 0
Equity affiliate accounting effect (1,526) (1,373) (704)
Effect of income taxes from international operations 3,132 (130) 608
State and local taxes on income, net of U.S. federal income tax benefit 162 39 (44)
Prior year tax adjustments, claims and settlements (51) (39) (349)
Tax credits (163) (199) (188)
Other U.S. (134) 447 (296)
Total income tax expense (benefit) $ 5,715 $ (48) $ (1,729)
Effective income tax rate 27.80% (0.50%) 80.00%
Deferred tax liabilities      
Properties, plant and equipment $ 20,159 $ 19,869  
Investments and other 4,943 4,796  
Total deferred tax liabilities 25,102 24,665  
Deferred tax assets      
Foreign tax credits (10,536) (11,872)  
Asset retirement obligations/environmental reserves (5,328) (5,511)  
Employee benefits (2,787) (3,129)  
Deferred credits (1,373) (1,769)  
Tax loss carryforwards (4,948) (5,463)  
Other accrued liabilities (595) (842)  
Inventory (505) (336)  
Miscellaneous (3,481) (2,415)  
Total deferred tax assets (29,553) (31,337)  
Deferred tax assets valuation allowance 15,973 16,574  
Total deferred taxes, net 11,522 9,902  
Classification of deferred taxes      
Deferred charges and other assets (4,399) (4,750)  
Noncurrent deferred income taxes 15,921 14,652  
Total deferred taxes, net $ 11,522 $ 9,902