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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
Goodwill gross, beginning balance |  | $ 5,198 | $ 5,185
Impairment | (1,731) | (1,731) |
Accumulated impairment losses, beginning balance |  | (28) | (28)
Goodwill, beginning balance |  | 5,170 | 5,157
Acquisition of businesses |  |  | (1)
Translation |  | (24) | 14
Goodwill gross, ending balance | 5,174 | 5,174 | 5,198
Accumulated impairment losses, ending balance | (1,759) | (1,759) | (28)
Goodwill, ending balance | 3,415 | 3,415 | 5,170
Alumina [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill gross, beginning balance |  | 10 | 11
Goodwill, beginning balance |  | 10 | 11
Translation |  | (1) | (1)
Goodwill gross, ending balance | 9 | 9 | 10
Goodwill, ending balance | 9 | 9 | 10
Primary Metals [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill gross, beginning balance |  | 997 | 991
Impairment | (1,731) | (989) |
Goodwill, beginning balance |  | 997 | 991
Translation |  | (8) | 6
Goodwill gross, ending balance | 989 | 989 | 997
Accumulated impairment losses, ending balance | (989) | (989) |
Goodwill, ending balance |  |  | 997
Global Rolled Products [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill gross, beginning balance |  | 214 | 208
Goodwill, beginning balance |  | 214 | 208
Translation |  | 4 | 6
Goodwill gross, ending balance | 218 | 218 | 214
Goodwill, ending balance | 218 | 218 | 214
Engineered Products and Solutions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill gross, beginning balance |  | 2,705 | 2,694
Accumulated impairment losses, beginning balance |  | (28) | (28)
Goodwill, beginning balance |  | 2,677 | 2,666
Acquisition of businesses |  |  | (1)
Translation |  | (7) | 12
Goodwill gross, ending balance | 2,698 | 2,698 | 2,705
Accumulated impairment losses, ending balance | (28) | (28) | (28)
Goodwill, ending balance | 2,670 | 2,670 | 2,677
Corporate [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill gross, beginning balance |  | 1,272 | 1,281
Impairment |  | (742) |
Goodwill, beginning balance |  | 1,272 | 1,281
Translation |  | (12) | (9)
Goodwill gross, ending balance | 1,260 | 1,260 | 1,272
Accumulated impairment losses, ending balance | (742) | (742) |
Goodwill, ending balance | $ 518 | $ 518 | $ 1,272

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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