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Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Aluminum Contracts [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Fair value measurement, Assets, Beginning balance | $ 349
Fair value measurement, Assets, Sales |
Fair value measurement, Assets, Cost of goods sold | (58)
Fair value measurement, Assets, Other expenses, net | (1)
Fair value measurement, Assets, Other comprehensive loss | 9
Fair value measurement, Assets, Purchases, sales, issuances, and settlements |
Fair value measurement, Assets, Transfers into and (or) out of Level 3 |
Fair value measurement, Assets, Foreign currency translation | 27
Fair value measurement, Assets, Ending balance | 326
Fair value measurement, Assets, Sales |
Fair value measurement, Assets, Cost of goods sold |
Fair value measurement, Assets, Other expenses, net | (1)
Fair value measurement, Liabilities, Beginning balance | 410
Fair value measurement, Liabilities, Sales | (5)
Fair value measurement, Liabilities, Cost of goods sold |
Fair value measurement, Liabilities, Other comprehensive loss | (21)
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements |
Fair value measurement, Liabilities, Transfers into and (or) out of Level 3 |
Fair value measurement, Liabilities, Foreign currency translation |
Fair value measurement, Liabilities, Ending balance | 384
Fair value measurement, Liabilities, Sales |
Fair value measurement, Liabilities, Cost of goods sold |
Embedded Credit Derivative [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Fair value measurement, Liabilities, Beginning balance | 21
Fair value measurement, Liabilities, Cost of goods sold |
Fair value measurement, Liabilities, Other income, net | (1)
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements |
Fair value measurement, Liabilities, Transfers into and (or) out of Level 3 |
Fair value measurement, Liabilities, Foreign currency translation |
Fair value measurement, Liabilities, Ending balance | 20
Fair value measurement, Liabilities, Sales |
Fair value measurement, Liabilities, Cost of goods sold |
Fair value measurement, Liabilities, Other income, net | (1)
Energy Contracts [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Fair value measurement, Assets, Beginning balance | 6
Fair value measurement, Assets, Sales |
Fair value measurement, Assets, Other comprehensive loss | 5
Fair value measurement, Assets, Purchases, sales, issuances, and settlements |
Fair value measurement, Assets, Transfers into and (or) out of Level 3 |
Fair value measurement, Assets, Ending balance | 11
Fair value measurement, Assets, Sales |
Fair value measurement, Assets, Cost of goods sold |

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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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