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Common and Preferred Shares and Warrants (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 25, 2013
Common And Preferred Shares And Warrants (Textuals) [Abstract]        
Common share repurchases authorized       150,000,000
Common shares repurchased 55,000,000 69,000,000    
Cost basis of common stock repurchased $ 3,943 $ 3,952 $ 2,300  
Commissions paid included in cost basis of common stock repurchased 1.1 1.0    
Common shares remaining under share repurchase authorizations 108,000,000      
Shares held as treasury shares 3,500,000 3,900,000 4,200,000  
Cost basis of treasury stock $ 260 $ 236 $ 217  
Preferred shares, authorized 20,000,000      
Preferred shares, par value 1.66      
Preferred stock, shares issued 0 0 0  
Preferred stock, shares outstanding 0 0 0