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Earnings Per Share (Earnings Per Share Computation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings per common share
Net income attributable to ExxonMobil		$ 3,970	$ 2,650	$ 11,330	$ 6,160
Weighted average number of common shares outstanding		4,271	4,178	4,252	4,178
Earnings per common share (dollars)	[1]	$ 0.93	$ 0.63	$ 2.66	$ 1.47
[1] The calculation of earnings per common share and earnings per common share - assuming dilution are the same in each period.

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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