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Loans (Details 18) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
First and second liens within outstanding residential mortgages loan portfolio    
Total $ 17,213 $ 16,676
First lien of Closed End [Member]
   
First and second liens within outstanding residential mortgages loan portfolio    
Total 14,758 14,113
Second lien of Closed End [Member]
   
First and second liens within outstanding residential mortgages loan portfolio    
Total 210 237
Revolving Second Lien [Member]
   
First and second liens within outstanding residential mortgages loan portfolio    
Total $ 2,245 $ 2,326