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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of Significant Accounting Policies  
Computation of basic and diluted earnings per common share
($ in millions, except per share data)
   2013   2012   2011  

Numerator:

                    

Net income

   $ 2,280   $ 2,306   $ 787  

Less: Preferred stock dividends

     17     —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net income available to common shareholders

     2,263     2,306     787  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Denominator:

                    

Weighted average common shares outstanding          

     464.4     489.4     520.7  

Effect of dilutive potential common shares:

                    

Stock options

     4.1     2.4     1.8  

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

     1.8     1.2     0.6  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Weighted average common and dilutive potential common shares outstanding

     470.3     493.0     523.1  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Earnings per common share – Basic

   $ 4.87   $ 4.71   $ 1.51  

Earnings per common share – Diluted

   $ 4.81   $ 4.68   $ 1.50