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Netting Arrangements (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Securities Sold under Agreements to Repurchase [Abstract]    
Securities sold under agreements to repurchase $ 25,000,000 $ 0
Securities Purchased under Agreements to Resell or Similar Arrangements [Member]
   
Securities Received as Collateral [Abstract]    
Fair value of non-cash collateral accepted 22,300,000,000 50,700,000,000
Fair value of non-cash collateral accepted that can be resold or repledged 16,400,000,000 39,800,000,000
Fair value of securities accepted as collateral that have been resold or repledged 0 0
Risk Management Derivatives [Member]
   
Securities Received as Collateral [Abstract]    
Fair value of non-cash collateral accepted $ 49,000,000 $ 24,000,000