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Derivative Instruments (Narratives) (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Aggregate fair value of all derivatives with credit-risk-related contingent features that were in a net liability position $ 2,100,000,000 $ 6,400,000,000
Fair values of collateral posted, aggregated 2,000,000,000 6,300,000,000
Additional collateral required to immediately settle our positions if the credit-risk-related contingent features were triggered $ 130,000,000 $ 159,000,000