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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 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2012
--- | --- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives | $ 249 | $ 390 | $ 596
Level 1 [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives | 8 | 6 |
Level 3 [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives | 217 | 355 |
Level 2 [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives | 27 | 32 |
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives | 48 | 69 |
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 | 8 | 4 |
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 | 5 | 9 |
Derivatives Designated as Hedging Instruments [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Contracts [Member] | Level 1 [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives |  | 2 |
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 | 6 | 9 |
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 | 8 | 16 |
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 | 21 | 23 |
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 |  | 6 |
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives | 204 | 324 |
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 | 104 | 149 |
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 | 100 | 175 |
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 | 3 |  |
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 |  | 3 |
Margin Held [Member] | Prepaid Expenses and Other Current Assets [Member] | Subtotal [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value asset derivatives | $ 3 | $ 3 |

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: 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=34720828&loc=SL20225862-175312 Reference 2: 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=35706170&loc=SL5624163-113959 Reference 3: 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=36459792&loc=SL20226000-175313 + Details
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