Pension And Other Postretirement Benefits [Abstract]

Change In Plan Assets Of Pension And Other Postretirement Benefits

		Pension Benefits				Other Postretirement
		U.S.		Non-U.S.		Benefits
		2019	2018	2019	2018	2019	2018
		(millions of dollars)
Change in plan assets
	Fair value at January 1	11,134	12,782	19,486	21,461	386	427
	Actual return on plan assets	2,521	(710)	3,210	(15)	54	(13)
	Foreign exchange rate changes	-	-	513	(1,320)	-	-
	Company contribution	1,022	491	602	438	41	30
	Benefits paid (1)	(1,041)	(1,429)	(883)	(903)	(56)	(58)
	Other	-	-	(12)	(175)	-	-
Fair value at December 31		13,636	11,134	22,916	19,486	425	386

(1)Benefit payments for funded plans.

Amounts Recorded In Balance Sheet And Other Comprehensive Income

		Pension Benefits				Other Postretirement
		U.S.		Non-U.S.		Benefits
		2019	2018	2019	2018	2019	2018
		(millions of dollars)
Assets in excess of/(less than) benefit obligation
	Balance at December 31 (1)	(7,323)	(7,040)	(7,002)	(5,892)	(7,688)	(7,085)

Amounts recorded in the consolidated balance
	sheet consist of:
	Other assets	-	-	1,151	1,174	-	-
	Current liabilities	(242)	(243)	(267)	(314)	(351)	(362)
	Postretirement benefits reserves	(7,081)	(6,797)	(7,886)	(6,752)	(7,337)	(6,723)
Total recorded		(7,323)	(7,040)	(7,002)	(5,892)	(7,688)	(7,085)

Amounts recorded in accumulated other
	comprehensive income consist of:
	Net actuarial loss/(gain)	3,971	3,831	5,662	4,713	1,339	877
	Prior service cost	1	6	360	(93)	(315)	(357)
Total recorded in accumulated other
	comprehensive income	3,972	3,837	6,022	4,620	1,024	520

(1) Fair value of assets less benefit obligation shown on the preceding page.

Summary Of Change In Accumulated Other Comprehensive Income

		Total Pension and
		Other Postretirement Benefits
		2019	2018	2017
		(millions of dollars)
(Charge)/credit to other comprehensive income, before tax
	U.S. pension	(135)	156	1,376
	Non-U.S. pension	(1,402)	823	63
	Other postretirement benefits	(504)	678	(160)
Total (charge)/credit to other comprehensive income, before tax		(2,041)	1,657	1,279
(Charge)/credit to income tax (see Note 4)		550	(470)	(290)
(Charge)/credit to investment in equity companies		(19)	24	(43)
(Charge)/credit to other comprehensive income including noncontrolling
	interests, after tax	(1,510)	1,211	946
Charge/(credit) to equity of noncontrolling interests		146	(114)	12
(Charge)/credit to other comprehensive income attributable to ExxonMobil		(1,364)	1,097	958

Fair Value Of The Benefit Plan Assets (Other Postretirement)

			Other Postretirement
			Fair Value Measurement
			at December 31, 2019, Using:
								Net
								Asset
				Level 1	Level 2		Level 3	Value (1)	Total
				(millions of dollars)
Asset category:
	Equity securities
		U.S.		-	-		-	81	81
		Non-U.S.		-	-		-	49	49
	Debt securities
		Corporate		-	92	(2)	-	-	92
		Government		-	200	(2)	-	-	200
		Asset-backed		-	-		-	-	-
	Cash			-	-		-	3	3
Total at fair value				-	292		-	133	425

(1) Per ASU 2015-07, certain instruments that are measured at fair value using the Net Asset Value (NAV) per share practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of plan assets.

(2) For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.

			Other Postretirement
			Fair Value Measurement
			at December 31, 2018, Using:
								Net
								Asset
				Level 1	Level 2		Level 3	Value (1)	Total
			(millions of dollars)
Asset category:
	Equity securities
		U.S.		-	-		-	64	64
		Non-U.S.		-	-		-	41	41
	Debt securities
		Corporate		-	88	(2)	-	-	88
		Government		-	189	(2)	-	-	189
		Asset-backed		-	-		-	-	-
	Cash			-	-		-	4	4
Total at fair value				-	277		-	109	386

(1)Per ASU 2015-07, certain instruments that are measured at fair value using the Net Asset Value (NAV) per share practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of plan assets.

(2)For corporate, government and asset-backed debt securities, fair value is based on observable inputs of comparable market transactions.

Estimated Next Year Amortization

					Other
			Pension Benefits		Postretirement
			U.S.	Non-U.S.	Benefits
		(millions of dollars)
Estimated 2020 amortization from accumulated other comprehensive income:
	Net actuarial loss/(gain) (1)		527	422		89
	Prior service cost (2)		5	70		(42)

(1)The Corporation amortizes the net balance of actuarial losses/(gains) as a component of net periodic benefit cost over the average remaining service period of active plan participants.

(2)The Corporation amortizes prior service cost on a straight-line basis as permitted under authoritative guidance for defined benefit pension and other postretirement benefit plans.