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Pre-Tax Gain (Loss) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Derivative [Line Items] |  |  |  |
Total gain (loss) | $ (3) |  | $ 1 | $ (7)
Exchange Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Total gain (loss) | (4) | 8 |  | 1
Forward Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Total gain (loss) | (1) | 2 | (2) | 3
Metal Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Total gain (loss) | $ 2 | $ (10) | $ 3 | $ (11)

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + 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 + Details
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