Goodwill and Other Intangible Assets (Identifiable Intangible Assets) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Gross Carrying Amount	$ 1,378		$ 1,378
Accumulated Amortization	(921)		(870)
Intangible assets, net (excluding goodwill), total	457		508
Core Deposit Intangibles [Member]
Gross Carrying Amount	626		626
Accumulated Amortization	(462)		(438)
Intangible assets, net (excluding goodwill), total	164		188
Other Identifiable Intangible Assets [Member]
Gross Carrying Amount	752	[1]	752	[1]
Accumulated Amortization	(459)	[1]	(432)	[1]
Intangible assets, net (excluding goodwill), total	$ 293	[1]	$ 320	[1]

[1] Other identifiable intangibles are primarily customer relationship intangibles.