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Derivative Instruments and Other Financial Instruments Used For Hedging (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2013
Derivative instruments and other financial instruments used for hedging (Textual) [Abstract]    
Income from accumulated other comprehensive income to net interest income   $ 15
Gain or (Loss) Recognized in Income on Derivative Instruments (Ineffective Portion and Amount Excluded from Effectiveness Testing) less than $1 million.  
Derivative instruments and other financial instruments used for hedging (Additional Textual) [Abstract]    
Aggregate fair value of all derivative instruments with credit-risk mitigated contingent features that are in a liability position 8  
Collateral to settle contracts 8  
Cash Flow Hedges [Member]
   
Derivative instruments and other financial instruments used for hedging (Textual) [Abstract]    
Weighted average remaining life of the currently active cash flow hedges 2 years  
Libor Indexed Borrowings [Member] | Interest Rate Cap [Member]
   
Derivative instruments and other financial instruments used for hedging (Textual) [Abstract]    
Derivative notional amount 1,000  
Short Term Fixed Rate Certificates Of Deposit [Member] | Interest Rate Cap [Member]
   
Derivative instruments and other financial instruments used for hedging (Textual) [Abstract]    
Derivative notional amount 3,000  
Libor Indexed Loans [Member] | Interest Rate Swap [Member]
   
Derivative instruments and other financial instruments used for hedging (Textual) [Abstract]    
Derivative notional amount $ 6,500