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Accrued Expenses and Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2015
Accrued Expenses and Other Long-Term Liabilities [Abstract] |
ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES |
9. | ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES
Accrued expenses and other long-term liabilities consisted of the following (in millions):
| Accrued Expenses |  | Other Long- Term Liabilities
| December 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
Defined benefit plan liabilities (see Note 13) | $ | 40 |  |  | $ | 48 |  |  | $ | 719 |  |  | $ | 792 |
Wage and other employee-related liabilities | 292 |  |  | 294 |  |  | 100 |  |  | 104 |
Uncertain income tax position liabilities (see Note 15) (a) | — |  |  | — |  |  | 148 |  |  | 316 |
Environmental liabilities | 27 |  |  | 26 |  |  | 231 |  |  | 269 |
Accrued interest expense | 96 |  |  | 88 |  |  | — |  |  | — |
Asset retirement obligations | 19 |  |  | 20 |  |  | 64 |  |  | 71 |
Other accrued liabilities | 80 |  |  | 120 |  |  | 349 |  |  | 387 |
Accrued expenses and other long-term liabilities | $ | 554 |  |  | $ | 596 |  |  | $ | 1,611 |  |  | $ | 1,939 |
___________________________ (a) As of December 31, 2015, our net liability for uncertain tax positions, including related penalties and interest, was $391 million. Of this amount, $438 million was classified as a current liability and reflected in income taxes payable, and $148 million was classified as a long-term liability and reflected in other long-term liabilities as detailed in this table. These liabilities were reduced by a $195 million receivable classified as a long-term asset and reflected in “deferred charges and other assets, net.” As of December 31, 2014, our total liability for uncertain tax positions, including related penalties and interest, was $484 million, with $168 million classified as a current liability and reflected in income taxes payable and the remaining $316 million classified as a long-term liability and reflected in other long-term liabilities as detailed in this table. During the years ended December 31, 2015, 2014, and 2013, there were no significant changes in our environmental liabilities or asset retirement obligations. See Note 2 for further information regarding the 2014 addition to our asset retirement obligations related to our Aruba Refinery. There are no assets that are legally restricted for purposes of settling our asset retirement obligations.

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