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	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,553	$ 3,603
Accumulated Amortization	(1,101)	(1,064)
Net Carrying Amount	2,452	2,539	2,443	2,459
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,613	2,653
Accumulated Amortization	(819)	(755)
Net Carrying Amount	1,794	1,898
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	700	706
Accumulated Amortization	(161)	(192)
Net Carrying Amount	539	514
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	240	244
Accumulated Amortization	(121)	(117)
Net Carrying Amount	$ 119	$ 127