Condensed Consolidated Statement Of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income including noncontrolling interests		$ 4,090	$ 1,781
Depreciation and depletion		4,519	4,765
Changes in operational working capital, excluding cash and debt		793	(399)
All other items - net		(1,229)	(1,335)
Net cash provided by operating activities		8,173	4,812
Cash flows from investing activities
Additions to property, plant and equipment		(2,890)	(4,601)
Proceeds associated with sales of subsidiaries, property, plant and equipment, and sales and returns of investments		687	177
Additional investments and advances		(1,738)	(234)
Other investing activities - net		180	309
Net cash used in investing activities		(3,761)	(4,349)
Cash flows from financing activities
Additions to long-term debt		60	11,963
Additions to short-term debt		1,734
Reductions in short-term debt		(2,669)	(28)
Additions/(reductions) in commercial paper, and debt with three months or less maturity	[1]	1,308	(7,594)
Cash dividends to ExxonMobil shareholders		(3,134)	(3,054)
Cash dividends to noncontrolling interests		(44)	(42)
Common stock acquired		(501)	(726)
Common stock sold			5
Net cash used in financing activities		(3,246)	524
Effects of exchange rate changes on cash		74	154
Increase/(decrease) in cash and cash equivalents		1,240	1,141
Cash and cash equivalents at beginning of period		3,657	3,705
Cash and cash equivalents at end of period		4,897	4,846
Supplemental Disclosures
Income taxes paid		1,970	749
Cash interest paid		$ 368	$ 223

[1] Includes a net addition of commercial paper with a maturity of over three months of $0.1 billion in 2017 and $0.7 billion in 2016. The gross amount of commercial paper with a maturity of over three months issued was $1.1 billion in 2017 and $1.0 billion in 2016, while the gross amount repaid was $1.0 billion in 2017 and $0.3 billion in 2016.