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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2015
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):
 
Years ended December 31,
 
2015
 
2014
 
2013
Income (Numerator):
 
 
 
 
 
Net income for basic and diluted EPS
$
6,939

 
$
5,158

 
$
5,081

 
 
 
 
 
 
Shares (Denominator):
 
 
 
 
 
Weighted-average shares for basic EPS
758

 
759

 
753

Effect of dilutive securities
8

 
11

 
12

Weighted-average shares for diluted EPS
766

 
770

 
765

 
 
 
 
 
 
Basic EPS
$
9.15

 
$
6.80

 
$
6.75

Diluted EPS
$
9.06

 
$
6.70

 
$
6.64