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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 Assets (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | $ 563 | $ 596
Level 1 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 5 | 27
Level 3 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 530 | 550
Level 2 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 42 | 45
Aluminum contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 5 | 17
Interest rate contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 28 | 28
Other noncurrent assets [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 14 | 26
Derivatives designated as hedging instruments [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 67 | 81
Derivatives designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member] | Aluminum contracts [Member] | Level 1 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 4 | 23
Derivatives designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member] | Aluminum contracts [Member] | Level 3 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 8 | 7
Derivatives designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member] | Interest rate contracts [Member] | Level 2 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 5 | 8
Derivatives designated as hedging instruments [Member] | Other noncurrent assets [Member] | Aluminum contracts [Member] | Level 1 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 1 | 3
Derivatives designated as hedging instruments [Member] | Other noncurrent assets [Member] | Aluminum contracts [Member] | Level 3 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 4 |
Derivatives designated as hedging instruments [Member] | Other noncurrent assets [Member] | Interest rate contracts [Member] | Level 2 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 37 | 37
Derivatives designated as hedging instruments [Member] | Other noncurrent assets [Member] | Energy contracts [Member] | Level 3 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 8 | 3
Derivatives not designated as hedging instruments [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 510 | 541
Derivatives not designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member] | Aluminum contracts [Member] | Level 3 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 216 | 211
Derivatives not designated as hedging instruments [Member] | Other noncurrent assets [Member] | Aluminum contracts [Member] | Level 3 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 294 | 329
Derivatives not designated as hedging instruments [Member] | Other noncurrent assets [Member] | Foreign exchange contracts [Member] | Level 1 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives |  | 1
Margin held [Member] | Prepaid expenses and other current assets [Member] | Aluminum contracts [Member] | Level 1 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives |  | 9
Margin held [Member] | Prepaid expenses and other current assets [Member] | Interest rate contracts [Member] | Level 2 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | 5 | 8
Margin held [Member] | Other noncurrent assets [Member] | Interest rate contracts [Member] | Level 2 [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value asset derivatives | $ 9 | $ 9

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- Definition Fair value of derivative asset, 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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