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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 | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ (19) | $ (8) | $ (6) | $ (12)
Sales [Member] | Aluminum Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (3) | (6) | (7) | (3)
Other Expenses (Income), Net [Member] | Aluminum Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (7) | 10 | 15 | 3
Other Expenses (Income), Net [Member] | Embedded Credit Derivative [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (7) | (10) | (9) | (10)
Other Expenses (Income), Net [Member] | Foreign Exchange Contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ (2) | $ (2) | $ (5) | $ (2)

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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 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: 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 3: 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 + Details
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