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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Long-Term Debt [Abstract]  
Summarized Long-Term Debt
2015 2014
(millions of dollars)
Exxon Mobil Corporation
0.921% notes due 20171,500 1,500
Floating-rate notes due 2017 (1)750 750
Floating-rate notes due 2018 (2)500 -
1.305% notes due 20181,600 -
1.819% notes due 20191,750 1,750
Floating-rate notes due 2019 (3)500 500
1.912% notes due 20201,500 -
2.397% notes due 20221,150 -
Floating-rate notes due 2022 (4)500 -
3.176% notes due 20241,000 1,000
2.709% notes due 20251,750 -
3.567% notes due 20451,000 -
XTO Energy Inc. (5)
5.650% senior notes due 2016 - 207
6.250% senior notes due 2017465 477
5.500% senior notes due 2018377 383
6.500% senior notes due 2018463 474
6.100% senior notes due 2036198 199
6.750% senior notes due 2037307 309
6.375% senior notes due 2038235 236
Mobil Producing Nigeria Unlimited (6)
Variable notes due 2016-2019101 399
Esso (Thailand) Public Company Ltd. (7)
Variable notes due 2016-202083 121
Mobil Corporation
8.625% debentures due 2021249 249
Industrial revenue bonds due 2017-2051 (8)2,611 2,611
Other U.S. dollar obligations (9)97 104
Other foreign currency obligations1 9
Capitalized lease obligations (10)1,238 375
Total long-term debt19,925 11,653

(1) Average effective interest rate of 0.3% in 2015 and 0.3% in 2014.

(2) Average effective interest rate of 0.4% in 2015.

(3) Average effective interest rate of 0.5% in 2015 and 0.4% in 2014.

(4) Average effective interest rate of 0.7% in 2015.

(5) Includes premiums of $179 million in 2015 and $219 million in 2014.

(6) Average effective interest rate of 4.6% in 2015 and 4.5% in 2014.

(7) Average effective interest rate of 2.1% in 2015 and 2.4% in 2014.

(8) Average effective interest rate of 0.02% in 2015 and 0.03% in 2014.

(9) Average effective interest rate of 3.8% in 2015 and 4.2% in 2014.

(10) Average imputed interest rate of 9.2% in 2015 and 7.0% in 2014.