Goodwill and Other Intangible Assets (Commercial and Residential Mortgage Servicing Rights) (Details) (USD $) In Millions, unless otherwise specified									6 Months Ended												6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Mortgage Servicing Rights [Member]	Dec. 31, 2013 Mortgage Servicing Rights [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Residential Mortgage [Member]	Dec. 31, 2013 Mortgage Servicing Rights [Member] Residential Mortgage [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Residential Mortgage [Member]	Dec. 31, 2012 Mortgage Servicing Rights [Member] Residential Mortgage [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Residential Mortgage [Member] Fair Value Changes - Time and Payoffs [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Residential Mortgage [Member] Fair Value Changes - Time and Payoffs [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Residential Mortgage [Member] Fair Value Changes - Other [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Residential Mortgage [Member] Fair Value Changes - Other [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Residential Mortgage [Member] From loans sold with servicing retained [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Residential Mortgage [Member] From loans sold with servicing retained [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Residential Mortgage [Member] Purchases [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Residential Mortgage [Member] Purchases [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Commercial Mortgage [Member]	Dec. 31, 2013 Mortgage Servicing Rights [Member] Commercial Mortgage [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Commercial Mortgage [Member]	Dec. 31, 2012 Mortgage Servicing Rights [Member] Commercial Mortgage [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Commercial Mortgage [Member] Fair Value Changes - Time and Payoffs [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Commercial Mortgage [Member] Fair Value Changes - Other [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Commercial Mortgage [Member] From loans sold with servicing retained [Member]	Jun. 30, 2014 Mortgage Servicing Rights [Member] Commercial Mortgage [Member] Purchases [Member]
Servicing Assets At Fair Value [Line Items]
Intangible assets, beginning balance	$ 1,997	$ 2,216	$ 1,482	$ 1,636	$ 967	$ 1,087	$ 975	$ 650									$ 515	$ 552	$ 525	$ 420
Additions													43	80	17	64							17	16
Changes in Fair Value									(64)	(105)	(116)	286									(45)	(25)
Intangible assets, ending balance	1,997	2,216	1,482	1,636	967	1,087	975	650									515	552	525	420
Unpaid principal balance of loans serviced for others at end of period					$ 110,933		$ 115,740										$ 143,226