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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
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)
2016
2015
2014
Net income
$
4,373

$
4,526

$
659

 
 
 
 
Basic weighted average shares outstanding
751

797

836

Dilutive effect of share-based awards
4

7

9

Diluted weighted average shares outstanding
755

804

845

 
 
 
 
Basic earnings per share
$
5.82

$
5.68

$
0.79

Diluted earnings per share
$
5.79

$
5.63

$
0.78