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Loan Servicing (Commercial Mortgage Banking Activities) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Loan Servicing [Abstract]    
UPB of CRE mortgages serviced for others $ 28,049 $ 29,520
CRE mortgages serviced for others covered by recourse provisions 4,850 4,970
Maximum recourse exposure from CRE mortgages sold with recourse liability 1,368 1,368
Recorded reserves related to recourse exposure 13 13
Originated CRE mortgages during the period - year to date $ 3,274 $ 4,934