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Derivatives and Other Financial Instruments - Schedule of Gain or Loss on Hedged Items and Derivative Contracts (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ 23 | $ 23 | $ 27 |  | $ (102)
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items | (22) | (5) | (39) | 124 |
Aluminum Contracts [Member] | Sales [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | 20 | 20 | 19 |  | (110)
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items | (19) | (2) | (31) | 132 |
Interest Rate Contracts [Member] | Interest Expense [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | 3 | 3 | 8 |  | 8
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items | $ (3) | $ (3) | $ (8) | $ (8) |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + 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=35706170&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 -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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