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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Summary of Significant Accounting Policies  
Computation of basic and diluted earnings per common share

 

 

($ in millions, except per share data)
   2014   2013   2012  

Numerator:

                    

Net income

   $ 2,850   $ 2,280   $ 2,306  

Less: Preferred stock dividends

     104     17     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net income available to common shareholders

     2,746     2,263     2,306  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Denominator:

                    

Weighted average common shares outstanding          

     431.4     464.4     489.4  

Effect of dilutive potential common shares:

                    

Stock options

     4.7     4.1     2.4  

Restricted stock units (non-participating) and performance stock awards

     2.1     1.8     1.2  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Weighted average common and dilutive potential common shares outstanding

     438.2     470.3     493.0  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Earnings per common share – Basic

   $ 6.37   $ 4.87   $ 4.71  

Earnings per common share – Diluted

   $ 6.27   $ 4.81   $ 4.68