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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Computation for basic and diluted earnings per share
The computation for basic and diluted EPS was as follows (in millions, except per share data):
 
2013
 
2012
 
2011
Income (Numerator):
 
 
 
 
 
Net income for basic and diluted EPS
$
5,081

 
$
4,345

 
$
3,683

 
 
 
 
 
 
Shares (Denominator):
 
 
 
 
 
Weighted-average shares for basic EPS
753

 
775

 
905

Effect of dilutive securities
12

 
12

 
7

Weighted-average shares for diluted EPS
765

 
787

 
912

 
 
 
 
 
 
Basic EPS
$
6.75

 
$
5.61

 
$
4.07

Diluted EPS
$
6.64

 
$
5.52

 
$
4.04