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Summary of Significant Accounting Policies, Textuals, Equity Method Investee (Details) (Anglesey Aluminum Limited, USD $) In Millions, unless otherwise specified | 3 Months Ended |
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Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Anglesey Aluminum Limited |  |  |
Noncontrolling Interest |  |  |
Ownership Percentage of Anglesey | 49.00% |  |
Equity in income from Anglesey | $ 0 | $ 0 |
Carrying amount of equity method investments | $ 0 |  | $ 0
Expected period of not resuming the use of equity method of accounting | 12 months |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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