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Earnings Per Share - Additional Information (Detail)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Stock Appreciation Rights
    
Earnings Per Share Disclosure [Line Items]    
Anti-dilutive securities31252823
Stock Options
    
Earnings Per Share Disclosure [Line Items]    
Anti-dilutive securities711912
Restricted Stock
    
Earnings Per Share Disclosure [Line Items]    
Anti-dilutive securities2211
Series G Preferred Stock
    
Earnings Per Share Disclosure [Line Items]    
Anti-dilutive securities 36 36