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, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Goodwill [Line Items]
Gross Carrying Amount	$ 3,268	$ 3,304
Accumulated Amortization	(934)	(845)
Net Carrying Amount	2,334	2,459	2,616	2,593
Customer Relationships [Member]
Goodwill [Line Items]
Gross Carrying Amount	2,349	2,369
Accumulated Amortization	(706)	(641)
Net Carrying Amount	1,643	1,728
Core Deposits Intangibles [Member]
Goodwill [Line Items]
Gross Carrying Amount	696	702
Accumulated Amortization	(134)	(117)
Net Carrying Amount	562	585
Other [Member]
Goodwill [Line Items]
Gross Carrying Amount	223	233
Accumulated Amortization	(94)	(87)
Net Carrying Amount	$ 129	$ 146