Goodwill and Other Intangible Assets (Changes in Goodwill by Business Segment) (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2011 Retail Banking [Member]		Sep. 30, 2011 Corporate & Institutional Banking [Member]		Sep. 30, 2011 Asset Management Group [Member]		Sep. 30, 2011 BlackRock [Member]		Sep. 30, 2011 Residential Mortgage Banking [Member]		Dec. 31, 2010 Residential Mortgage Banking [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 8,149		$ 5,302	[1]	$ 2,728	[1]	$ 62	[1]	$ 14	[1]	$ 43	[1]	$ 43	[1]
BankAtlantic branch acquisition	41	[1]	35	[1]	6	[1]
Other adjustments to goodwill	17	[1]	11	[1]	7	[1]	2	[1]	(3)	[1]
Goodwill, Ending Balance	$ 8,207		$ 5,348	[1]	$ 2,741	[1]	$ 64	[1]	$ 11	[1]	$ 43	[1]	$ 43	[1]

[1] The Distressed Assets Portfolio business segment does not have any goodwill allocated to it.