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Derivatives and Other Financial Instruments - Gross Amounts of Recognized Derivative Assets and Liabilities and Gross Amounts Offset in Accompanying Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized, assets | $ 72 | $ 117
Gross amounts offset, assets | (39) | (72)
Net amount presented in Consolidated Balance Sheet, assets | 33 | 45
Gross amounts recognized, liabilities | 84 | 86
Gross amounts offset, liabilities | (39) | (72)
Net amount presented in Consolidated Balance Sheet, liabilities | 45 | 14
Aluminum Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized, assets | 40 | 72
Gross amounts offset, assets | (36) | (55)
Net amount presented in Consolidated Balance Sheet, assets | 4 | 17
Gross amounts recognized, liabilities | 81 | 69
Gross amounts offset, liabilities | (36) | (55)
Net amount presented in Consolidated Balance Sheet, liabilities | 45 | 14
Interest Rate Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized, assets | 32 | 45
Gross amounts offset, assets | (3) | (17)
Net amount presented in Consolidated Balance Sheet, assets | 29 | 28
Gross amounts recognized, liabilities | 3 | 17
Gross amounts offset, liabilities | $ (3) | $ (17)

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