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Restructuring And Other Charges (Pro Forma Restructuring And Other Charges By Reportable Segments, Pretax) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Restructuring and other charges | $ 9 | $ 2 | $ 49 | $ 219
Alumina [Member] |  |  |  |
Restructuring and other charges | 6 |  | 32 | 13
Primary Metals [Member] |  |  |  |
Restructuring and other charges | (6) | (7) | (4) | 145
Flat-Rolled Products [Member] |  |  |  |
Restructuring and other charges | 5 |  | 7 | (7)
Engineered Products and Solutions [Member] |  |  |  |
Restructuring and other charges | (2) |  | 1 | 22
Segment Total [Member] |  |  |  |
Restructuring and other charges | 3 | (7) | 36 | 173
Corporate [Member] |  |  |  |
Restructuring and other charges | $ 6 | $ 9 | $ 13 | $ 46

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- Definition The amount of change in the restructuring reserve related to foreign currency translation adjustments and any other adjustments not separately disclosed or provided for elsewhere in the Taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringReserveTranslationAndOtherAdjustment
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration