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Netting Arrangements (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Securities Received as Collateral [Abstract]    
Fair value of non-cash collateral we pledged for securities sold under agreements to repurchase $ 218,000,000 [1] $ 0
Fair value of non-cash collateral we pledged for securities sold under agreements to repurchase of which the counterparty was permitted to sell or repledge 218,000,000  
Securities sold under agreements to repurchase   0
Federal Funds Sold and Securities Purchased under Agreements to Resell or Similar Arrangements [Member]
   
Securities Received as Collateral [Abstract]    
Fair value of non-cash collateral accepted 80,100,000,000 46,200,000,000
Fair value of non-cash collateral that can be resold or repledged 40,000,000,000 25,000,000,000
Fair value of securities received as collateral that have been resold or repledged 0 0
OTC risk management derivatives [Member]
   
Securities Received as Collateral [Abstract]    
Securities Received as Collateral $ 40,000,000 $ 54,000,000
[1] Represents non-cash collateral posted or received that has neither been recognized nor offset in our condensed consolidated balance sheets. Does not include collateral held in excess of our exposure.