| 2013 | 2012 | |||||||
| (millions of dollars) | ||||||||
| XTO Energy Inc. (1) | ||||||||
| 4.900% senior note due 2014 | - | 254 | ||||||
| 5.000% senior note due 2015 | 132 | 135 | ||||||
| 5.300% senior note due 2015 | 243 | 249 | ||||||
| 5.650% senior note due 2016 | 212 | 217 | ||||||
| 6.250% senior note due 2017 | 489 | 501 | ||||||
| 5.500% senior note due 2018 | 389 | 396 | ||||||
| 6.500% senior note due 2018 | 485 | 495 | ||||||
| 6.100% senior note due 2036 | 200 | 201 | ||||||
| 6.750% senior note due 2037 | 312 | 314 | ||||||
| 6.375% senior note due 2038 | 238 | 240 | ||||||
| Mobil Services (Bahamas) Ltd. (2) | ||||||||
| Variable note due 2034 | - | 311 | ||||||
| Mobil Producing Nigeria Unlimited (3) | ||||||||
| Variable notes due 2014-2019 | 742 | 751 | ||||||
| Esso (Thailand) Public Company Ltd. (4) | ||||||||
| Variable notes due 2014-2017 | 177 | 414 | ||||||
| Mobil Corporation | ||||||||
| 8.625% debentures due 2021 | 249 | 249 | ||||||
| Industrial revenue bonds due 2014-2051 (5) | 2,527 | 2,690 | ||||||
| Other U.S. dollar obligations (6) | 112 | 74 | ||||||
| Other foreign currency obligations | 9 | 6 | ||||||
| Capitalized lease obligations (7) | 375 | 431 | ||||||
| Total long-term debt | 6,891 | 7,928 | ||||||
(1) Includes premiums of $271 million in 2013 and $326 million in 2012.
(2) Average effective interest rate of 0.5% in 2012.
(3) Average effective interest rate of 4.6% in 2013 and 4.6% in 2012.
(4) Average effective interest rate of 3.3% in 2013 and 3.5% in 2012.
(5) Average effective interest rate of 0.1% in 2013 and 0.1% in 2012.
(6) Average effective interest rate of 4.4% in 2013 and 2.7% in 2012.
(7) Average imputed interest rate of 7.8% in 2013 and 7.6% in 2012.