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	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,629	$ 3,603
Accumulated Amortization	(1,233)	(1,064)
Net Carrying Amount	2,396	2,539	2,311	2,459
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,669	2,653
Accumulated Amortization	(917)	(755)
Net Carrying Amount	1,752	1,898
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	712	706
Accumulated Amortization	(180)	(192)
Net Carrying Amount	532	514
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	248	244
Accumulated Amortization	(136)	(117)
Net Carrying Amount	$ 112	$ 127