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Restructuring and Other Charges - Schedule of Restructuring and other Charges by Reportable Segments, Pretax (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total restructuring and other charges | $ 2 | $ 9 | $ 27 | $ 49 | $ 130
Alumina [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total restructuring and other charges |  | 6 | 1 | 32 |
Primary Metals [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total restructuring and other charges | 3 | (6) | 9 | (4) |
Global Rolled Products [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total restructuring and other charges |  | 5 | 1 | 7 |
Engineered Products and Solutions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total restructuring and other charges |  | (2) | 3 | 1 |
Segment Total [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total restructuring and other charges | 3 | 3 | 14 | 36 |
Corporate [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total restructuring and other charges | $ (1) | $ 6 | $ 13 | $ 13 |

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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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: 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 4: 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 5: 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 + Details
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- Details
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