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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted The following table shows the computation of basic and diluted earnings per share:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions, except per share data)
2017
2016
 
2017
2016
Net income
$
1,224

$
1,546

 
$
1,827

$
2,492

 
 
 
 
 
 
Basic weighted average shares outstanding
728

758

 
728

766

Dilutive effect of share-based awards
3

5

 
3

6

Diluted weighted average shares outstanding
731

763

 
731

772

 
 
 
 
 
 
Basic earnings per share
$
1.68

$
2.04

 
$
2.51

$
3.25

Diluted earnings per share
$
1.68

$
2.03

 
$
2.50

$
3.23