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Loans (Details 17) (USD $)
In Billions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
High LTV interest-only and ARM loans    
Residential mortgage loans with high LTV and no mortgage insurance $ 1.0 $ 1.1
Interest-only residential mortgage loans 4.0 3.9
ARM loans $ 10.0 $ 9.9