Consolidated Statement Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income including noncontrolling interests	$ 21,421	$ 19,848	$ 8,375
Adjustments for noncash transactions
Depreciation and depletion	18,745	19,893	22,308
Deferred income tax charges/(credits)	(60)	(8,577)	(4,386)
Postretirement benefits expense in excess of/(less than) net payments	1,070	1,135	(329)
Other long-term obligation provisions in excess of/(less than) payments	(68)	(610)	(19)
Dividends received greater than/(less than) equity in current earnings of equity companies	(1,684)	131	(579)
Changes in operational working capital, excluding cash and debt
Reduction/(increase) - Notes and accounts receivable	(545)	(3,954)	(2,090)
Reduction/(increase) - Inventories	(3,107)	(1,682)	(388)
Reduction/(increase) - Other current assets	(25)	(117)	171
Increase/(reduction) - Accounts and other payables	2,321	5,104	915
Net (gain) on asset sales	(1,993)	(334)	(1,682)
All other items - net	(61)	(771)	(214)
Net cash provided by operating activities	36,014	30,066	22,082
Cash flows from investing activities
Additions to property, plant and equipment	(19,574)	(15,402)	(16,163)
Proceeds associated with sales of subsidiaries, property, plant and equipment, and sales and returns of investments	4,123	3,103	4,275
Additional investments and advances	(1,981)	(5,507)	(1,417)
Other investing activities including collection of advances	986	2,076	902
Net cash used in investing activities	(16,446)	(15,730)	(12,403)
Cash flows from financing activities
Additions to long-term debt	46	60	12,066
Additions to short-term debt		1,735
Reductions in short-term debt	(4,752)	(5,024)	(314)
Additions/(reductions) in commercial paper, and debt with three months or less maturity	(219)	2,181	(7,459)
Cash dividends to ExxonMobil shareholders	(13,798)	(13,001)	(12,453)
Cash dividends to noncontrolling interests	(243)	(184)	(162)
Changes in noncontrolling interests	146	(150)
Common stock acquired	(626)	(747)	(977)
Common stock sold			6
Net cash used in financing activities	(19,446)	(15,130)	(9,293)
Effects of exchange rate changes on cash	(257)	314	(434)
Increase/(decrease) in cash and cash equivalents	(135)	(480)	(48)
Cash and cash equivalents at beginning of year	3,177	3,657	3,705
Cash and cash equivalents at end of year	$ 3,042	$ 3,177	$ 3,657