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Fair Value Disclosures (Fair Value and Unpaid Principal Balance of LHFS) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
LHFS $ 1,692 $ 1,222
Fair Value [Member]
   
LHFS 1,692 1,222
Aggregate UPB [Member]
   
LHFS 1,644 1,223
Fair Value Less Aggregate UPB [Member]
   
LHFS $ 48 $ (1)