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Earnings Per Share (Tables)
 12 Months Ended
May 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following is a reconciliation from basic earnings per common share to diluted earnings per common share. The computations of diluted earnings per common share excluded options, including shares under ESPPs, to purchase an additional 17.5 million, 42.9 million and 30.5 million shares of common stock outstanding for the years ended May 31, 2019, 2018 and 2017, respectively, because the options were anti-dilutive.
 
YEAR ENDED MAY 31,
(Dollars in millions, except per share data)
2019
2018
2017
Net income available to common stockholders
$
4,029

$
1,933

$
4,240

Determination of shares:
 
 
 
Weighted average common shares outstanding
1,579.7

1,623.8

1,657.8

Assumed conversion of dilutive stock options and awards
38.7

35.3

34.2

DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
1,618.4

1,659.1

1,692.0

Earnings per common share:
 
 
 
Basic
$
2.55

$
1.19

$
2.56

Diluted
$
2.49

$
1.17

$
2.51