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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted earnings per share The following table shows our computation of basic and diluted earnings per share:
 
Year Ended December 31,
(in millions, except per share data)
2018
2017
2016
Net income
$
3,935

$
3,205

$
4,195

 
 
 
 
Basic weighted average shares outstanding
691

720

751

Dilutive effect of share-based awards
3

3

4

Diluted weighted average shares outstanding
694

723

755

 
 
 
 
Basic earnings per share
$
5.69

$
4.45

$
5.59

Diluted earnings per share
$
5.67

$
4.43

$
5.55