Goodwill and Other Intangible Assets (Changes in Goodwill by Business Segment) (Details) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011 Retail Banking [Member]	Jun. 30, 2011 Corporate & Institutional Banking [Member]	Jun. 30, 2011 Asset Management Group [Member]	Jun. 30, 2011 BlackRock [Member]	Jun. 30, 2011 Residential Mortgage Banking [Member]	Dec. 31, 2010 Residential Mortgage Banking [Member]
Goodwill, Beginning Balance	$ 8,149	$ 5,302	$ 2,728	$ 62	$ 14	$ 43	$ 43
BankAtlantic branch acquisition	41	35	6
Other adjustments to goodwill	(8)	(2)	(2)	(1)	(3)
Goodwill, Ending Balance	$ 8,182	$ 5,335	$ 2,732	$ 61	$ 11	$ 43	$ 43

Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant