Goodwill and Other Intangible Assets (Gross Carrying Amount, Accumulated Amortization And Net Carrying Amount Of Other Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,563	$ 3,603
Accumulated Amortization	(1,157)	(1,064)
Net Carrying Amount	2,406	2,539	2,334	2,459
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,618	2,653
Accumulated Amortization	(859)	(755)
Net Carrying Amount	1,759	1,898
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	703	706
Accumulated Amortization	(170)	(192)
Net Carrying Amount	533	514
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	242	244
Accumulated Amortization	(128)	(117)
Net Carrying Amount	$ 114	$ 127