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Fair Value (Quantitative Information) (Details) (USD $) | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
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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 | $ (69,000,000) | $ (396,000,000) | $ (122,000,000) | $ (148,000,000)
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 | (72,000,000) | (412,000,000) | (124,000,000) | (128,000,000)
Interest Rate Derivatives | Minimum |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 2.15% |  |  |
Interest Rate Derivatives | Maximum |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 9.03% |  |  |
Interest Rate Derivatives | Weighted Average |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 4.35% |  |  |
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 | 70,000,000 |  |  |
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 | 14.4 |  |  |
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 | 21.2 |  |  |
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 | 17.7 |  |  |
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 | (65,000,000) |  |  |
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) | 0.06 |  |  |
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) | $ 0.12 |  |  |

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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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- 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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