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Investments and Derivative Instruments (Details 6) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2011
Movement in Valuation allowance and reserves      
Balance, beginning of period $ (67)   $ (68)
(Additions)/Reversals 0 (2)  
Deductions 50 2  
Balance, end of period $ (17) $ (68) $ (68)