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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
(in millions, except per share data)
2017
2016
 
2017
2016
Net income
$
1,178

$
1,259

 
$
3,005

$
3,751

 
 
 
 
 
 
Basic weighted average shares outstanding
716

740

 
724

758

Dilutive effect of share-based awards
3

4

 
3

4

Diluted weighted average shares outstanding
719

744

 
727

762

 
 
 
 
 
 
Basic earnings per share
$
1.64

$
1.70

 
$
4.15

$
4.95

Diluted earnings per share
$
1.64

$
1.69

 
$
4.13

$
4.92