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Restructuring And Other Charges (Schedule Of Restructuring And Other Charges By Reportable Segments, Pretax) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 10 | $ 6
Alumina [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges |  | 1
Primary Metals [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 5 | 2
Global Rolled Products [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 1 | 2
Engineered Products And Solutions [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 3 |
Segment Total [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 9 | 5
Corporate [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 1 | $ 1

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + 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) -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)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 + Details
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- Details
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