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Accrued Expenses and Other Long-Term Liabilities (Tables) | 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 | 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.

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