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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 | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized | $ 146 | $ 117
Gross amounts offset | (108) | (72)
Net amount presented in Consolidated Balance Sheet | 470 | 596
Gross amounts recognized | 177 | 86
Gross amounts offset | (108) | (72)
Net amount presented in Consolidated Balance Sheet | 69 | 14
Aluminum Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized | 110 | 72
Gross amounts offset | (104) | (55)
Net amount presented in Consolidated Balance Sheet | 6 | 17
Gross amounts recognized | 171 | 69
Gross amounts offset | (104) | (55)
Net amount presented in Consolidated Balance Sheet | 67 | 14
Interest Rate Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized | 35 | 45
Gross amounts offset | (3) | (17)
Net amount presented in Consolidated Balance Sheet | 32 | 28
Gross amounts recognized | 3 | 17
Gross amounts offset | (3) | (17)
Foreign Exchange Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized | 1 |
Gross amounts offset | (1) |
Gross amounts recognized | 3 |
Gross amounts offset | (1) |
Net amount presented in Consolidated Balance Sheet | $ 2 |

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