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, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Goodwill [Line Items]
Gross Carrying Amount	$ 3,300	$ 3,304
Accumulated Amortization	(989)	(845)
Net Carrying Amount	2,311	2,459	2,486	2,593
Customer Relationships [Member]
Goodwill [Line Items]
Gross Carrying Amount	2,373	2,369
Accumulated Amortization	(710)	(641)
Net Carrying Amount	1,663	1,728
Core Deposits Intangibles [Member]
Goodwill [Line Items]
Gross Carrying Amount	701	702
Accumulated Amortization	(178)	(117)
Net Carrying Amount	523	585
Other [Member]
Goodwill [Line Items]
Gross Carrying Amount	226	233
Accumulated Amortization	(101)	(87)
Net Carrying Amount	$ 125	$ 146