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Goodwill and Other Intangible Assets (Changes in Goodwill by Business Segment) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
BankAtlantic Branch Acquisition [Member]
Dec. 31, 2011
Flagstar Branch Acquisition [Member]
Dec. 31, 2011
Retail Banking [Member]
Dec. 31, 2010
Retail Banking [Member]
Dec. 31, 2011
Retail Banking [Member]
BankAtlantic Branch Acquisition [Member]
Dec. 31, 2011
Retail Banking [Member]
Flagstar Branch Acquisition [Member]
Dec. 31, 2011
Corporate & Institutional Banking [Member]
Dec. 31, 2010
Corporate & Institutional Banking [Member]
Dec. 31, 2011
Corporate & Institutional Banking [Member]
BankAtlantic Branch Acquisition [Member]
Dec. 31, 2011
Asset Management Group [Member]
Dec. 31, 2010
Asset Management Group [Member]
Dec. 31, 2011
Residential Mortgage Banking [Member]
Dec. 31, 2010
Residential Mortgage Banking [Member]
Dec. 31, 2009
Residential Mortgage Banking [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Goodwill [Line Items]                                    
Goodwill, Beginning Balance $ 8,149 [1] $ 9,505 [1]     $ 5,302 [1] $ 5,369 [1]     $ 2,728 [1] $ 2,756 [1]   $ 62 [1] $ 68 [1] $ 43 [1] $ 43 [1] $ 43 [1] $ 14 [1],[2] $ 1,269 [1],[2]
Goodwill Acquired During Period     41 [1]       35 [1]       6 [1]              
Sale of GIS   (1,232) [1]                               (1,232) [1],[2]
Other adjustments to goodwill 78 [1] (124) [1]   (17) [1] 40 [1] (67) [1]   (17) [1] 29 [1] (28) [1]   7 [1] (6) [1]       2 [1],[2] (23) [1],[2]
Goodwill, Ending Balance $ 8,285 [1] $ 8,149 [1]     $ 5,394 [1] $ 5,302 [1]     $ 2,763 [1] $ 2,728 [1]   $ 69 [1] $ 62 [1] $ 43 [1] $ 43 [1] $ 43 [1] $ 16 [1],[2] $ 14 [1],[2]
[1] The Non-Strategic Assets Portfolio business segment does not have any goodwill allocated to it.
[2] Includes goodwill related to BlackRock and GIS prior to the sale of GIS on July 1, 2010. See Note 2 Acquisition and Divestiture Activity for additional information regarding our July 1, 2010 sale of GIS.