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Accrued Expenses and Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2014
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,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Defined benefit plan liabilities (see Note 14) |  | $ | 48 |  |  | $ | 30 |  |  | $ | 792 |  |  | $ | 507 |
Wage and other employee-related liabilities |  | 294 |  |  | 257 |  |  | 104 |  |  | 97 |
Uncertain income tax position liabilities, including related penalties and interest (see Note 16) (a) |  | — |  |  | — |  |  | 316 |  |  | 205 |
Environmental liabilities |  | 26 |  |  | 24 |  |  | 269 |  |  | 277 |
Accrued interest expense |  | 88 |  |  | 90 |  |  | — |  |  | — |
Derivative liabilities |  | — |  |  | 13 |  |  | — |  |  | — |
Asset retirement obligations |  | 20 |  |  | 5 |  |  | 71 |  |  | 26 |
Other accrued liabilities |  | 120 |  |  | 103 |  |  | 387 |  |  | 217 |
Accrued expenses and other long-term liabilities |  | $ | 596 |  |  | $ | 522 |  |  | $ | 1,939 |  |  | $ | 1,329 |
___________________________ (a) 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. As of December 31, 2013, our total liability for uncertain tax positions, including related penalties and interest, was $443 million, with $238 million classified as a current liability and reflected in “Income taxes payable” and the remaining $205 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table.
Changes in environmental liabilities | Changes in our environmental liabilities were as follows (in millions):
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Balance as of beginning of year | $ | 301 |  |  | $ | 269 |  |  | $ | 274 |
Additions to liability | 26 |  |  | 67 |  |  | 23 |
Reductions to liability | — |  |  | (1 | ) |  | (1 | )
Payments, net of third-party recoveries | (27 | ) |  | (28 | ) |  | (29 | )
Separation of retail business | — |  |  | (4 | ) |  | — |
Foreign currency translation | (5 | ) |  | (2 | ) |  | 2 |
Balance as of end of year | $ | 295 |  |  | $ | 301 |  |  | $ | 269 |
Changes in asset retirement obligations | Changes in our asset retirement obligations were as follows (in millions).
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
Balance as of beginning of year | $ | 31 |  |  | $ | 108 |  |  | $ | 87 |
Additions to accrual | 60 |  |  | 2 |  |  | 14 |
Revisions in estimated cash flows | — |  |  | — |  |  | 13 |
Accretion expense | 1 |  |  | 2 |  |  | 5 |
Settlements | (1 | ) |  | (1 | ) |  | (11 | )
Separation of retail business | — |  |  | (80 | ) |  | — |
Balance as of end of year | $ | 91 |  |  | $ | 31 |  |  | $ | 108 |

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