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Derivatives and Other Financial Instruments - Schedule of Fair Values and Corresponding Level of Fair Value Hierarchy of Outstanding Derivative Contracts Recorded as Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Derivative [Line Items] |  |
Fair value liability derivatives | $ 504 | $ 679
Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 105 | 15
Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 434 | 638
Level 2 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives |  | 26
Derivatives Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 493 | 622
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 73 | 13
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 22 | 35
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 3 |
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 22 | 1
Derivatives Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 373 | 573
Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 46 | 57
Derivatives Not Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 5 | 1
Derivatives Not Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 2 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives |  | 21
Derivatives Not Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Embedded Credit Derivative [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 4 | 3
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 1 |
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 2 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives |  | 5
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 1 |
Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Embedded Credit Derivative [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 35 | 27
Margin Posted [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 35 |
Margin Posted [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 34 |
Margin Posted [Member] | Other Current Liabilities [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | $ 1 |

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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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