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Common and Preferred Shares and Warrants (Details Textuals) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Component of Operating Other Cost and Expense [Line Items]      
Preferred shares     $ 20
Common shares repurchased 48 14  
Cost basis of treasury stock 2,300.0 590.0 0
Cost basis of treasury stock 217 219 235
Common And Preferred Shares And Warrants (Textuals) [Abstract]      
Common shares remaining under share repurchase authorizations 38    
Shares held as treasury shares 4.2 4.7 5.0
Preferred shares, authorized 20    
Preferred shares, par value 1.66    
Issuance of American Express Series A preferred shares and warrants 0 0 3,389
Cumulative Perpetual Preferred Shares Series A issued     3.39
Fixed rate of Cumulative Perpetual Preferred Shares Series A     5.00%
Common shares purchased related to a ten year warrant     24
Exercise price of common shares purchased     $ 20.95
Repurchase of American Express Series A preferred shares 0 0 3,389
Reduction to earnings per share (EPS) attributable to common shareholders     $ 0.18
Repurchase of warrants 0 0 340
Accelerated Accretion Expense [Member]
      
Component of Operating Other Cost and Expense [Line Items]      
Preferred shares     212
Commissions Paid [Member]
      
Component of Operating Other Cost and Expense [Line Items]      
Cost basis of treasury stock $ 1.0 $ 0.2