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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Summary of Significant Accounting Policies.  
Computation of basic and diluted earnings per share

 

 

($ in millions, except per share data)
   2012   2011   2010  

Numerator:

                    

Net income

  
$
2,306		  
$
787		  
$
911		  
               

Denominator:

                    

Weighted average common shares outstanding

     489.4     520.7     540.3  

Effect of dilutive potential common shares:

                    

Stock options

     2.4     1.8     2.0  

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

     1.2     0.6     0.2  
               

Weighted average common and dilutive potential common shares outstanding

     493.0     523.1     542.5  
               

Earnings per share – Basic

  
$
4.71		  
$
1.51		  
$
1.69		  

Earnings per share – Diluted

   $ 4.68   $ 1.50   $ 1.68