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Investments and Derivative Instruments (Details 6) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Commercial [Member]
Dec. 31, 2013
Commercial [Member]
Movement in Valuation allowance and reserves        
Balance, beginning of period   $ (68) $ (19) $ (67)
(Additions)/Reversals (3) (2)    
Deductions 51 2    
Balance, end of period   $ (68) $ (19) $ (67)