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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
(in millions, except per share data)
2017
2016
Net income
$
603

$
946

 
 
 
Basic weighted average shares outstanding
728

774

Dilutive effect of share-based awards
3

6

Diluted weighted average shares outstanding
731

780

 
 
 
Basic earnings per share
$
0.83

$
1.22

Diluted earnings per share
$
0.82

$
1.21