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Accrued Expenses and Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2012
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 as of December 31 (in millions):
| Accrued Expenses |  | Other Long-Term Liabilities
| 2012 |  | 2011 |  | 2012 |  | 2011
Defined benefit plan liabilities (see Note 14) | $ | 32 |  |  | $ | 37 |  |  | $ | 982 |  |  | $ | 795 |
Wage and other employee-related liabilities | 282 |  |  | 259 |  |  | 91 |  |  | 79 |
Uncertain income tax position liabilities (see Note 16) | — |  |  | — |  |  | 391 |  |  | 337 |
Environmental liabilities | 27 |  |  | 39 |  |  | 242 |  |  | 235 |
Accrued interest expense | 96 |  |  | 108 |  |  | — |  |  | — |
Derivative liabilities | 14 |  |  | 25 |  |  | — |  |  | — |
Asset retirement obligations | 5 |  |  | 6 |  |  | 103 |  |  | 81 |
Other accrued liabilities | 134 |  |  | 121 |  |  | 321 |  |  | 354 |
Accrued expenses and other long-term liabilities | $ | 590 |  |  | $ | 595 |  |  | $ | 2,130 |  |  | $ | 1,881 |
Changes in environmental liabilities | Changes in our environmental liabilities were as follows (in millions):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Balance as of beginning of year | $ | 274 |  |  | $ | 268 |  |  | $ | 279 |
Pembroke Acquisition | — |  |  | 30 |  |  | — |
Additions to liability | 23 |  |  | 18 |  |  | 50 |
Reductions to liability | (1 | ) |  | (5 | ) |  | (21 | )
Payments, net of third-party recoveries | (29 | ) |  | (35 | ) |  | (42 | )
Foreign currency translation | 2 |  |  | (2 | ) |  | 2 |
Balance as of end of year | $ | 269 |  |  | $ | 274 |  |  | $ | 268 |
Changes in asset retirement obligations | Changes in our asset retirement obligations were as follows (in millions).
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Balance as of beginning of year | $ | 87 |  |  | $ | 101 |  |  | $ | 179 |
Additions to accrual | 28 |  |  | 4 |  |  | 3 |
Reductions to accrual | (1 | ) |  | — |  |  | (34 | )
Accretion expense | 5 |  |  | 4 |  |  | 7 |
Settlements | (11 | ) |  | (22 | ) |  | (54 | )
Balance as of end of year | $ | 108 |  |  | $ | 87 |  |  | $ | 101 |

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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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