Summary of Significant Accounting Policies Summary of Significant Accounting Policies, Textuals, Equity Method Investee (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Noncontrolling Interest
Income (Loss) from Equity Method Investments	$ 0	$ 0	$ 0
Expected period of not resuming the use of equity method of accounting	12 months
Anglesey Aluminum Limited
Noncontrolling Interest
Ownership Percentage of Anglesey	49.00%
Income (Loss) from Equity Method Investments	0	0	0
Carrying amount of equity method investments	$ 0	$ 0

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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+ Details