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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted earnings per share 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)
2018
2017
 
2018
2017
Net income
$
1,025

$
1,186

 
$
1,572

$
1,747

 
 
 
 
 
 
Basic weighted average shares outstanding
695

728

 
699

728

Dilutive effect of share-based awards
2

3

 
2

3

Diluted weighted average shares outstanding
697

731

 
701

731

 
 
 
 
 
 
Basic earnings per share
$
1.47

$
1.63

 
$
2.25

$
2.40

Diluted earnings per share
$
1.47

$
1.62

 
$
2.24

$
2.39