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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 | Dec. 31, 2012 | Dec. 31, 2011
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Derivative [Line Items] |  |
Fair value liability derivatives | $ 679 | $ 737
Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 15 | 64
Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 638 | 630
Level 2 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 26 | 44
Derivatives Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 622 | 653
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 13 | 47
Derivatives Designated as Hedging Instruments [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 35 | 32
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 | 1 | 4
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 | 573 | 570
Derivatives Not Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 57 | 85
Derivatives Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 1 | 12
Derivatives Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 2 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 21 | 23
Derivatives Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Embedded Credit Derivative [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 3 |
Derivatives Not Designated as Hedging Instrument [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 Instrument [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Aluminum Contracts [Member] | Level 2 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 5 | 21
Derivatives Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities and Deferred Credits [Member] | Embedded Credit Derivative [Member] | Level 3 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives | 27 | 28
Less Margin Posted [Member] | Other Current Liabilities [Member] | Aluminum Contracts [Member] | Level 1 [Member] |  |
Derivative [Line Items] |  |
Fair value liability derivatives |  | $ 1

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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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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