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Accrued Expenses and Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2017
Accrued Expenses and Other Long-Term Liabilities [Abstract] |
ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES |
7. | 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, |  | December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Defined benefit plan liabilities (see Note 12) | $ | 33 |  |  | $ | 32 |  |  | $ | 776 |  |  | $ | 742 |
Wage and other employee-related liabilities | 278 |  |  | 225 |  |  | 111 |  |  | 103 |
Uncertain income tax position liabilities (see Note 14) | — |  |  | — |  |  | 723 |  |  | 465 |
Repatriation tax liability (see Note 14) | — |  |  | — |  |  | 597 |  |  | — |
Environmental liabilities | 30 |  |  | 29 |  |  | 232 |  |  | 223 |
Environmental credit obligations (see Note 18) | 152 |  |  | 214 |  |  | — |  |  | — |
Accrued interest expense | 105 |  |  | 104 |  |  | — |  |  | — |
Other accrued liabilities | 114 |  |  | 90 |  |  | 290 |  |  | 211 |
Accrued expenses and other long-term liabilities | $ | 712 |  |  | $ | 694 |  |  | $ | 2,729 |  |  | $ | 1,744 |
There were no significant changes in our environmental liabilities during each of the years in the three-year period ended December 31, 2017.

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