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Fair Value (Quantitative Information) (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value | $ (396,000,000) | $ (148,000,000) | $ 49,000,000
Interest Rate Derivatives |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value | (412,000,000) | (128,000,000) | (1,000,000)
Interest Rate Derivatives | Minimum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 2.60% |  |
Interest Rate Derivatives | Maximum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 9.80% |  |
Interest Rate Derivatives | Weighted Average |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 6.50% |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value | 69,000,000 |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Minimum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 2 years | 10.50 |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Maximum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 2 years | 15.40 |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Weighted Average |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 2 years | 12.90 |  |
Commodity And Other Derivative Other [Member] |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value | 2,000,000 |  |
Commodity And Other Embedded Derivative Aluminum [Member] |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value | (55,000,000) |  |
Commodity And Other Embedded Derivative Aluminum [Member] | Minimum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Market Price of Power for Customer in Cameroon (per KWh) | 0.09 |  |
Commodity And Other Embedded Derivative Aluminum [Member] | Maximum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Market Price of Power for Customer in Cameroon (per KWh) | 0.14 |  |
Commodity And Other Embedded Derivative Aluminum [Member] | Weighted Average |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Market Price of Power for Customer in Cameroon (per KWh) | $ 0.13 |  |

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- Definition The credit rating used by the parent company or subsidiary to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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- Definition This element represents net derivative assets and liabilities measured at fair value using significant unobservable inputs (Level 3) which are required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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- Definition The market price of power for customers in Cameroon used to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The U.S. Dollar indexation in Argentina used to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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