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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Carrying Value of Recorded AROs by Major Category | The following table details the carrying value of recorded AROs by major category (of which $75 and $76 was classified as a current liability as of December 31, 2012 and 2011, respectively):
December 31, |  | 2012 |  |  | 2011 |
Spent pot lining disposal |  | $ | 182 |  |  | $ | 187 |
Closure of bauxite residue areas |  |  | 190 |  |  |  | 173 |
Mine reclamation |  |  | 189 |  |  |  | 164 |
Demolition* |  |  | 28 |  |  |  | 34 |
Landfill closure |  |  | 17 |  |  |  | 17 |
Other |  |  | 4 |  |  |  | 4 |
|  | $ | 610 |  |  | $ | 579 |
* | In 2011, AROs were recorded as a result of management’s decision to permanently shut down and demolish certain structures, each of which was previously temporarily idled for different reasons (see Note D).
Schedule of Changes in Carrying Value of Recorded AROs | The following table details the changes in the total carrying value of recorded AROs:
December 31, |  | 2012 |  |  | 2011 |
Balance at beginning of year |  | $ | 579 |  |  | $ | 534 |
Accretion expense |  |  | 25 |  |  |  | 22 |
Payments |  |  | (81 | ) |  |  | (86 | )
Liabilities incurred |  |  | 80 |  |  |  | 115 |
Foreign currency translation and other |  |  | 7 |  |  |  | (6 | )
Balance at end of year |  | $ | 610 |  |  | $ | 579 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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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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