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	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Gross Carrying Amount	$ 3,304	$ 3,271
Accumulated Amortization	(845)	(678)
Net Carrying Amount	2,459	2,593	1,810
Customer Relationships [Member]
Goodwill [Line Items]
Gross Carrying Amount	2,369	2,341
Accumulated Amortization	(641)	(520)
Net Carrying Amount	1,728	1,821
Core Deposits Intangibles [Member]
Goodwill [Line Items]
Gross Carrying Amount	702	710
Accumulated Amortization	(117)	(83)
Net Carrying Amount	585	627
Other Intangible Assets [Member]
Goodwill [Line Items]
Gross Carrying Amount	233	220
Accumulated Amortization	(87)	(75)
Net Carrying Amount	$ 146	$ 145