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Accrued Expenses and Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2013
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,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Defined benefit plan liabilities (see Note 14) |  | $ | 30 |  |  | $ | 32 |  |  | $ | 507 |  |  | $ | 982 |
Wage and other employee-related liabilities |  | 257 |  |  | 282 |  |  | 97 |  |  | 91 |
Uncertain income tax position liabilities, including related penalties and interest (see Note 16) (a) |  | — |  |  | — |  |  | 205 |  |  | 391 |
Environmental liabilities |  | 24 |  |  | 27 |  |  | 277 |  |  | 242 |
Accrued interest expense |  | 90 |  |  | 96 |  |  | — |  |  | — |
Derivative liabilities |  | 13 |  |  | 14 |  |  | — |  |  | — |
Asset retirement obligations |  | 5 |  |  | 5 |  |  | 26 |  |  | 103 |
Other accrued liabilities |  | 103 |  |  | 134 |  |  | 217 |  |  | 321 |
Accrued expenses and other long-term liabilities |  | $ | 522 |  |  | $ | 590 |  |  | $ | 1,329 |  |  | $ | 2,130 |
___________________________ (a) 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. As of December 31, 2012, our total liability for uncertain tax positions, including related penalties and interest, was 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,
| 2013 |  | 2012 |  | 2011
Balance as of beginning of year | $ | 269 |  |  | $ | 274 |  |  | $ | 268 |
Pembroke Acquisition | — |  |  | — |  |  | 30 |
Additions to liability | 67 |  |  | 23 |  |  | 18 |
Reductions to liability | (1 | ) |  | (1 | ) |  | (5 | )
Payments, net of third-party recoveries | (28 | ) |  | (29 | ) |  | (35 | )
Separation of retail business | (4 | ) |  | — |  |  | — |
Foreign currency translation | (2 | ) |  | 2 |  |  | (2 | )
Balance as of end of year | $ | 301 |  |  | $ | 269 |  |  | $ | 274 |
Changes in asset retirement obligations | Changes in our asset retirement obligations were as follows (in millions).
| Year Ended December 31,
| 2013 |  | 2012 |  | 2011
Balance as of beginning of year | $ | 108 |  |  | $ | 87 |  |  | $ | 101 |
Additions to accrual | 2 |  |  | 14 |  |  | 3 |
Revisions in estimated cash flows | — |  |  | 13 |  |  | 1 |
Accretion expense | 2 |  |  | 5 |  |  | 4 |
Settlements | (1 | ) |  | (11 | ) |  | (22 | )
Separation of retail business | (80 | ) |  | — |  |  | — |
Balance as of end of year | $ | 31 |  |  | $ | 108 |  |  | $ | 87 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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