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Fair Value Fair Value Measurement (Narratives) (Details) (HARP loans [Member], USD $)
In Billions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Changes due to new accounting guidance or enhanced fair value estimation process [Line Items]    
Loans in portfolio that have been refinanced under HARP $ 306.9 $ 255.2
Fair Value Estimation Process [Member]
   
Changes due to new accounting guidance or enhanced fair value estimation process [Line Items]    
Changes in estimated fair value $ 11.5 $ 7.6