XML 175 R38.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Asset Retirement Obligations (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Asset Retirement Obligations [Abstract] |
Schedule Of Carrying Value Of Recorded AROs By Major Category |
December 31, |  | 2011 |  |  | 2010 |
Spent pot lining disposal |  | $ | 187 |  |  | $ | 177 |
Closure of bauxite residue areas |  |  | 173 |  |  |  | 156 |
Mine reclamation |  |  | 164 |  |  |  | 156 |
Demolition* |  |  | 34 |  |  |  | 24 |
Landfill closure |  |  | 17 |  |  |  | 19 |
Other |  |  | 4 |  |  |  | 2 |
|  | $ | 579 |  |  | $ | 534 |
* | In 2011 and 2010, 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 Total Carrying Value Of Recorded AROs |
December 31, |  | 2011 |  |  | 2010 |
Balance at beginning of year |  | $ | 534 |  |  | $ | 453 |
Accretion expense |  |  | 22 |  |  |  | 21 |
Payments |  |  | (86 | ) |  |  | (38 | )
Liabilities incurred |  |  | 115 |  |  |  | 43 |
Translation and other |  |  | (6 | ) |  |  | 55 |
Balance at end of year |  | $ | 579 |  |  | $ | 534 |

X
- Details
Name: | us-gaap_AssetRetirementObligationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 410 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Topic 410 -SubTopic 30 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 5 -Section 50 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration