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Summary Of Significant Accounting Policies (Weighted-Average Useful Lives Of Software And Other Intangible Assets) (Details) | 12 Months Ended
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Dec. 31, 2011
Computer Software [Member] | Alumina [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average useful lives of other intangible assets | 10
Computer Software [Member] | Primary Metals [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average useful lives of other intangible assets | 10
Computer Software [Member] | Flat-Rolled Products [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average useful lives of other intangible assets | 9
Computer Software [Member] | Engineered Products And Solutions [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average useful lives of other intangible assets | 9
Other Intangible Assets [Member] | Primary Metals [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average useful lives of other intangible assets | 40
Other Intangible Assets [Member] | Flat-Rolled Products [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average useful lives of other intangible assets | 10
Other Intangible Assets [Member] | Engineered Products And Solutions [Member] |
Finite-Lived Intangible Assets [Line Items] |
Weighted-average useful lives of other intangible assets | 17

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- Definition The calculated weighted-average useful life of all finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
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