Loan Servicing (Commercial Mortgage Banking Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Loan Servicing [Abstract]
UPB of CRE mortgages serviced for others	$ 28,095	$ 29,520
CRE mortgages serviced for others covered by recourse provisions	4,594	4,970
Maximum recourse exposure from CRE mortgages sold with recourse liability	1,320	1,368
Recorded reserves related to recourse exposure	9	13
Originated CRE mortgages during the period - year to date	$ 4,881	$ 4,934