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Fair Value (Quantitative Information) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012
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Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Fair Value | $ (60) | $ 14 | $ (4) | $ 16 | $ (4) | $ (341)
Interest rate derivatives [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Fair Value | (183) | (87) | (101) | (63) | (72) | (412)
Interest rate derivatives [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Subsidiaries' credit risk | 3.75% |  |  |  |  |
Interest rate derivatives [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Subsidiaries' credit risk | 5.30% |  |  |  |  |
Interest rate derivatives [Member] | Weighted Average [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Subsidiaries' credit risk | 4.67% |  |  |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Fair Value | 111 |  |  |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 8.36 |  |  |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 30.60 |  |  |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Weighted Average [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 20.06 |  |  |  |  |
Foreign Currency Embedded Derivative Euro [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Fair Value | (4) |  |  |  |  |
Subsidiaries' credit risk | 5.30% |  |  |  |  |
Commodity And Other Derivative Other [Member] |  |  |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |  |  |
Fair Value | $ 16 |  |  |  |  |

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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 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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