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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 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized, Assets | $ 74 | $ 72
Gross amounts offset, Assets | (42) | (39)
Net amounts presented in Consolidated Balance Sheet, Assets | 32 | 33
Gross amounts recognized, Liabilities | 49 | 84
Gross amounts offset, Liabilities | (42) | (39)
Net amounts presented in Consolidated Balance Sheet, Liabilities | 7 | 45
Aluminum Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized, Assets | 47 | 40
Gross amounts offset, Assets | (42) | (36)
Net amounts presented in Consolidated Balance Sheet, Assets | 5 | 4
Gross amounts recognized, Liabilities | 49 | 81
Gross amounts offset, Liabilities | (42) | (36)
Net amounts presented in Consolidated Balance Sheet, Liabilities | 7 | 45
Interest Rate Contracts [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross amounts recognized, Assets | 27 | 32
Gross amounts offset, Assets |  | (3)
Net amounts presented in Consolidated Balance Sheet, Assets | 27 | 29
Gross amounts recognized, Liabilities |  | 3
Gross amounts offset, Liabilities |  | (3)
Net amounts presented in Consolidated Balance Sheet, Liabilities | $ 0 | $ 0

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