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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
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