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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 | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ 20 | $ 13 | $ 39
Aluminum Contracts [Member] | Sales [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (9) |  | (13)
Aluminum Contracts [Member] | Other Income, Net [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | 27 | 16 | 13
Embedded Credit Derivative [Member] | Other Income, Net [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | 8 | (3) | (5)
Energy Contracts [Member] | Other Income, Net [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives |  |  | 47
Foreign Exchange Contracts [Member] | Other Income, Net [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ (6) |  | $ (3)

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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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