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Taxes (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (loss) before income taxes      
United States $ (441) $ (4,317) $ (2,877)
International 9,662 2,157 7,719
Income (Loss) Before Income Tax Expense 9,221 (2,160) 4,842
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Theoretical tax (at U.S. statutory rate of 35%) 3,227 (756) 1,695
Effect of U.S. tax reform (2,020) 0 0
Equity affiliate accounting effect (1,373) (704) (1,286)
Effect of income taxes from international operations (130) 608 72
State and local taxes on income, net of U.S. federal income tax benefit 39 (44) (74)
Prior year tax adjustments, claims and settlements (39) (349) 84
Tax credits (199) (188) (35)
Other U.S. 447 (296) (324)
Total income tax expense (benefit) $ (48) $ (1,729) $ 132
Effective income tax rate (0.50%) 80.00% 2.70%
U.S. statutory tax rate 35.00%    
Deferred tax liabilities      
Properties, plant and equipment $ 19,869 $ 25,180  
Investments and other 4,796 5,222  
Total deferred tax liabilities 24,665 30,402  
Deferred tax assets      
Foreign tax credits (11,872) (10,976)  
Asset retirement obligations/environmental reserves (5,511) (6,251)  
Employee benefits (3,129) (4,392)  
Deferred credits (1,769) (1,950)  
Tax loss carryforwards (5,463) (6,030)  
Other accrued liabilities (842) (510)  
Inventory (336) (374)  
Miscellaneous (2,415) (3,121)  
Total deferred tax assets (31,337) (33,604)  
Deferred tax assets valuation allowance 16,574 16,069  
Total deferred taxes, net 9,902 12,867  
Classification of deferred taxes      
Deferred charges and other assets (4,750) (4,649)  
Noncurrent deferred income taxes 14,652 17,516  
Total deferred taxes, net $ 9,902 $ 12,867