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Condensed Consolidated Statement Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidated Statement Of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 4,085	$ 2,889	$ 11,439	$ 6,351
Other comprehensive income (net of income taxes)
Foreign exchange translation adjustment	2,342	(107)	5,424	2,506
Adjustment for foreign exchange translation (gain)/loss included in net income			234
Postretirement benefits reserves adjustment (excluding amortization)	(145)	34	(329)	25
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs	311	278	850	859
Total other comprehensive income	2,508	205	6,179	3,390
Comprehensive income including noncontrolling interests	6,593	3,094	17,618	9,741
Comprehensive income attributable to noncontrolling interests	372	166	700	536
Comprehensive income attributable to ExxonMobil	$ 6,221	$ 2,928	$ 16,918	$ 9,205

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