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Segment and Geographic Area Information - Sales by Major Product Grouping (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue | $ 5,898 | $ 5,833 | $ 5,963 | $ 6,006 | $ 5,989 | $ 6,419 | $ 6,585 | $ 5,958 | $ 23,700 | $ 24,951 | $ 21,013
Alumina [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 2,962 | 3,350 | 2,740
Primary aluminum [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 7,121 | 7,907 | 6,842
Flat-rolled aluminum [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 7,378 | 7,642 | 6,277
Investment castings [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 1,747 | 1,700 | 1,521
Alcoa Fastening Systems [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 1,414 | 1,313 | 1,070
Architectural aluminum systems [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 970 | 973 | 884
Aluminum wheels [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 692 | 656 | 475
Other extruded aluminum and forged products [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | 955 | 1,010 | 930
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue |  |  |  |  |  |  |  |  | $ 461 | $ 400 | $ 274

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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