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Divestiture and Discontinued Operations [Details 2] (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Segment, Discontinued Operations [Member] | Education Lending [Member]
         
ASSETS          
Fair Value of Loans $ 3,100 $ 3,223 $ 3,100 $ 3,223 $ 3,125
LIABILITIES          
Fair Value of Securities 2,919 3,092 2,919 3,092 2,966
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textuals) [Abstract]          
Unearned Income 1 1 1 1 1
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax 12 15 25 30  
Education Lending [Member]
         
ASSETS          
Contractual Amount of Loans 3,175   3,175    
Fair Value of Loans 3,100   3,100    
Contractual Amount of Other Assets 34   34    
Fair Value of Other Assets 34   34    
LIABILITIES          
Contractual Amount of Securities 3,282   3,282    
Fair Value of Securities 2,919   2,919    
Contractual Amount of Other Liabilities 30   30    
Fair Value of Other Liabilities 30   30    
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textuals) [Abstract]          
Economic interest or risk of loss associated with Education loan securitization trusts 185   185    
Contractual Values [Member]
         
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textuals) [Abstract]          
Loans held by the trust in nonaccrual status 18   18    
Loans held by trusts with unpaid balances ninety days or more past due 43   43    
Fair Value [Member]
         
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textuals) [Abstract]          
Loans held by the trust in nonaccrual status 18   18    
Loans held by trusts with unpaid balances ninety days or more past due 42   42    
Segment, Discontinued Operations [Member]
         
ASSETS          
Fair Value of Loans 3,100 3,223 3,100 3,223 3,125
LIABILITIES          
Fair Value of Securities 2,919 3,092 2,919 3,092 2,966
Assumptions Used To Measure Fair Value of Assets And Liabilities (Textuals) [Abstract]          
Unearned Income 1 1 1 1 1
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax $ 12 $ 15 $ 25 $ 30