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Derivatives and Other Financial Instruments - Schedule of Gains and Losses on Derivative Excluded from Assessment of Effectiveness Recognized in Current Earnings (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 28 | $ 107
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) | (4) | (6)
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  |
Aluminum Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) | 23 | 104
Aluminum Contracts [Member] | Other Expenses (Income), Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  |
Aluminum Contracts [Member] | Sales [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) | (4) | (6)
Energy Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) | 2 | 2
Energy Contracts [Member] | Other Expenses (Income), Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  |
Energy Contracts [Member] | Cost of Goods Sold [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) |  |
Foreign Exchange Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) | 2 |
Foreign Exchange Contracts [Member] | Other Expenses (Income), Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  |
Foreign Exchange Contracts [Member] | Sales [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) |  |
Interest Rate Contracts [Member] | Other Expenses (Income), Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  |
Interest Rate Contracts [Member] | Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) |  |
Interest Rate Contract 2 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) | 1 | 1
Interest Rate Contract 2 [Member] | Other Expenses (Income), Net [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion) |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) |  |

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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