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Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share (Detail) (USD $)
In Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Earnings per share:    
Net income attributable to Bancorp$ 381$ 238$ 983$ 420
Dividends on preferred stock863194187
Net income (loss) available to common shareholders373175789233
Less: Income allocated to participating securities2141
Net income allocated to common shareholders371174785232
Earnings per diluted share:    
Net income available to common shareholders373175789233
Series G convertible preferred stock9 26 
Net income available to common shareholders plus assumed conversions382175815233
Less: Income allocated to participating securities2141
Net income allocated to common shareholders plus assumed conversions$ 380$ 174$ 811$ 232
Earnings per share:    
Net income allocated to common shareholders915791904791
Effect of dilutive securities:    
Stock-based awards5455
Series G convertible preferred stock35 36 
Warrant related to Series F preferred stock 223
Net income allocated to common shareholders plus assumed conversions406438
Earnings per share:    
Net income allocated to common shareholders$ 0.41$ 0.22$ 0.87$ 0.29
Effect of dilutive securities:    
Series G convertible preferred stock$ (0.01) $ (0.01) 
Net income allocated to common shareholders plus assumed conversions$ (0.01)$ 797,000,000.00$ 947,000,000.00$ 0.29