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Earnings Per Share (Earnings Per Share Computation) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings per common share    
Net income attributable to ExxonMobil $ 4,940us-gaap_NetIncomeLoss $ 9,100us-gaap_NetIncomeLoss
Weighted average number of common shares outstanding 4,211us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 4,328us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Earnings per common share (dollars) $ 1.17us-gaap_EarningsPerShareBasic [1] $ 2.1us-gaap_EarningsPerShareBasic [1]
[1]
The calculation of earnings per common share and earnings per common share-assuming dilution are the same in each period.