Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Long-Term Debt [Abstract]

Summarized Long-Term Debt

			Average
			Rate (1)	2018	2017
				(millions of dollars)
Exxon Mobil Corporation
	1.819% notes due 2019			-	1,750
	1.708% notes due 2019			-	1,250
	Floating-rate notes due 2019 (Issued 2014)			-	500
	Floating-rate notes due 2019 (Issued 2016)			-	250
	1.912% notes due 2020			1,500	1,500
	2.222% notes due 2021			2,500	2,500
	2.397% notes due 2022			1,150	1,150
	Floating-rate notes due 2022		2.502%	500	500
	2.726% notes due 2023			1,250	1,250
	3.176% notes due 2024			1,000	1,000
	2.709% notes due 2025			1,750	1,750
	3.043% notes due 2026			2,500	2,500
	3.567% notes due 2045			1,000	1,000
	4.114% notes due 2046			2,500	2,500
XTO Energy Inc.(2)
	6.100% senior notes due 2036			195	195
	6.750% senior notes due 2037			299	302
	6.375% senior notes due 2038			230	232
Mobil Corporation
	8.625% debentures due 2021			250	250
Industrial revenue bonds due 2019-2051			1.334%	2,513	2,559
Other U.S. dollar obligations				102	162
Other foreign currency obligations				38	34
Capitalized lease obligations			9.440%	1,303	1,327
Debt issuance costs				(42)	(55)
		Total long-term debt		20,538	24,406

(1)Average effective interest rate for debt and average imputed interest rate for capitalized leases at December 31, 2018.

(2) Includes premiums of $97 million in 2018 and $102 million in 2017.