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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014
Aluminum Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value measurement, Assets, Beginning balance | $ 281 | $ 349
Fair value measurement, Assets, Sales |  |
Fair value measurement, Assets, Cost of goods sold | (36) | (147)
Fair value measurement, Assets, Other expenses, net | (12) | (13)
Fair value measurement, Assets, Other comprehensive loss | (11) | (11)
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 | (5) | 39
Fair value measurement, Assets, Ending balance | 217 | 217
Fair value measurement, Assets, Sales |  |
Fair value measurement, Assets, Cost of goods sold |  |
Fair value measurement, Assets, Other expenses, net | (12) | (13)
Fair value measurement, Liabilities, Beginning balance | 422 | 410
Fair value measurement, Liabilities, Sales | (8) | (19)
Fair value measurement, Liabilities, Cost of goods sold |  |
Fair value measurement, Liabilities, Other income, net |  |
Fair value measurement, Liabilities, Other comprehensive income | (7) | 16
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 | 407 | 407
Fair value measurement, Liabilities, Sales |  |
Fair value measurement, Liabilities, Cost of goods sold |  |
Fair value measurement, Liabilities, Other income, net |  |
Embedded Credit Derivative [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value measurement, Liabilities, Beginning balance | 14 | 21
Fair value measurement, Liabilities, Sales |  |
Fair value measurement, Liabilities, Cost of goods sold |  |
Fair value measurement, Liabilities, Other income, net | 10 | 3
Fair value measurement, Liabilities, Other comprehensive income |  |
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 | 24 | 24
Fair value measurement, Liabilities, Sales |  |
Fair value measurement, Liabilities, Cost of goods sold |  |
Fair value measurement, Liabilities, Other income, net | 10 | 3
Energy Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value measurement, Assets, Beginning balance | 24 | 6
Fair value measurement, Assets, Sales |  |
Fair value measurement, Assets, Cost of goods sold |  |
Fair value measurement, Assets, Other expenses, net | (5) |
Fair value measurement, Assets, Other comprehensive loss | (18) | (6)
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 | (1) |
Fair value measurement, Assets, Ending balance |  |
Fair value measurement, Assets, Sales |  |
Fair value measurement, Assets, Cost of goods sold |  |
Fair value measurement, Assets, Other expenses, net | (5) |
Fair value measurement, Liabilities, Beginning balance |  |
Fair value measurement, Liabilities, Sales |  |
Fair value measurement, Liabilities, Cost of goods sold |  |
Fair value measurement, Liabilities, Other income, net |  |
Fair value measurement, Liabilities, Other comprehensive income | 6 | 6
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 | 6 | 6
Fair value measurement, Liabilities, Sales |  |
Fair value measurement, Liabilities, Cost of goods sold |  |
Fair value measurement, Liabilities, Other income, net |  |

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