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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Computation for basic and diluted earnings per share
The computations for basic and diluted EPS were as follows (in millions, except per share data):
 
Three months ended
 
Six months ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Income (Numerator):
 
 
 
 
 
 
 
Net income for basic and diluted EPS
$
1,870

 
$
1,653

 
$
3,770


$
3,276

 
 
 
 
 
 
 
 
Shares (Denominator):
 
 
 
 
 
 
 
Weighted-average shares for basic EPS
751

 
760

 
753

 
761

Effect of dilutive securities
5

 
8

 
6

 
8

Weighted-average shares for diluted EPS
756

 
768

 
759

 
769

 
 
 
 
 
 
 
 
Basic EPS
$
2.49

 
$
2.18

 
$
5.01

 
$
4.30

Diluted EPS
$
2.47

 
$
2.15

 
$
4.97

 
$
4.26