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Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Aluminum Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of year | $ 547 | $ 10
Fair value measurement, Assets, Sales | (5) | (8)
Fair value measurement, Assets, Cost of goods sold | (202) | (107)
Fair value measurement, Assets, Other income, net | 28 | 16
Fair value measurement, Assets, Other comprehensive loss | 22 | 10
Fair value measurement, Assets, Purchases, sales, issuances, and settlements |  | 596
Fair value measurement, Assets, Transfers into and (or) out of Level 3 |  |
Fair value measurement, Assets, Foreign currency translation | (41) | 30
Balance at end of year | 349 | 547
Fair value measurement, Assets, Sales |  |
Fair value measurement, Assets, Cost of goods sold |  |
Fair value measurement, Assets, Other income, net | 28 | 16
Fair value measurement, Liabilities, Beginning balance | 608 | 602
Fair value measurement, Liabilities, Sales | (24) | (33)
Fair value measurement, Liabilities, Other comprehensive loss | (174) | 39
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 | 410 | 608
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 | 30 | 28
Fair value measurement, Liabilities, Cost of goods sold | (1) | (1)
Fair value measurement, Liabilities, Other income, net | (8) | 3
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 | 21 | 30
Fair value measurement, Liabilities, Sales |  |
Fair value measurement, Liabilities, Cost of goods sold |  |
Fair value measurement, Liabilities, Other income, net | (8) | 3
Energy Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of year | 3 | 2
Fair value measurement, Assets, Other comprehensive loss | 3 | 1
Fair value measurement, Assets, Purchases, sales, issuances, and settlements |  |
Fair value measurement, Assets, Transfers into and (or) out of Level 3 |  |
Balance at end of year | 6 | 3
Fair value measurement, Assets, Sales |  |
Fair value measurement, Assets, Cost of goods sold |  |

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