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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
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Mar. 31, 2014 | Mar. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 461 | $ 7
Operating Segments [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 432 | 6
Corporate, Non-Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 29 | 1
Alumina [Member] | Operating Segments [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 7 |
Primary Metals [Member] | Operating Segments [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 331 |
Global Rolled Products [Member] | Operating Segments [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | 90 | 3
Engineered Products and Solutions [Member] | Operating Segments [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and other charges | $ 4 | $ 3

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: 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 3: 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=27011515&loc=d3e140904-122747 Reference 4: 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=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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