Operating Segments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2014 Community Banking [Member]	Jan. 31, 2014 Residential Mortgage Banking [Member]	Oct. 31, 2013 Residential Mortgage Banking [Member]	Oct. 31, 2013 Specialized Lending [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Loans transferred in					$ 8,300	$ 230
Loans transferred out				8,300			230
Residential mortgage loans sold	28,900	25,640	17,202
Loans sold							$ 500