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Derivatives and Other Financial Instruments - Schedule of Quantitative Information for Level 3 Derivative Contracts (Parenthetical) (Detail) (Aluminum Contracts [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Aluminum Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Decrease in Fair value of assets and liabilities	$ 8

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- Details

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- Definition

The increase (decrease) during the period in the net carrying value of derivative instruments reported as assets and liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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