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Derivatives and Other Financial Instruments - Schedule of Fair Value Gains and Losses on Derivatives Contracts Recorded in Earnings (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ 13 | $ (3)
Sales [Member] | Aluminum contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (4) | 3
Other income, net [Member] | Aluminum contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | 22 | (7)
Other income, net [Member] | Embedded credit derivative [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (2) |
Other income, net [Member] | Foreign exchange contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ (3) | $ 1

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- Definition The aggregate net gain (loss) on price risk derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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