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Earnings Per Common Share
 3 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Common Share
Earnings Per Common Share
Basic earnings per common share are computed by dividing net income by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per common share are computed similarly to basic earnings per common share except that the former reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. Diluted loss per share for the first quarter of 2019 was calculated by excluding potentially dilutive securities from the denominator of the share computation due to their anti-dilutive effects.
The computations for basic and diluted earnings or loss per common share are as follows:
  
Quarter Ended June 30,
(In millions, except per share amounts)
2019
 
2018
Income (Loss) from continuing operations
$
483

 
$
(81
)
Net income attributable to noncontrolling interests
(54
)
 
(58
)
Income (Loss) from continuing operations attributable to McKesson
429

 
(139
)
Income (Loss) from discontinued operations, net of tax
(6
)
 
1

Net income (loss) attributable to McKesson
$
423

 
$
(138
)
 
 
 
 
Weighted average common shares outstanding:
 
 
 
Basic
188

 
202

Effect of dilutive securities:
 
 
 
Restricted stock units
1

 
—

Diluted
189

 
202

 
 
 
 
Earnings (Loss) per common share attributable to McKesson: (1)
 
 
 
Diluted
 
 
 
Continuing operations
$
2.27

 
$
(0.69
)
Discontinued operations
(0.03
)
 
0.01

Total
$
2.24

 
$
(0.68
)
Basic
 
 
 
Continuing operations
$
2.28

 
$
(0.69
)
Discontinued operations
(0.03
)
 
0.01

Total
$
2.25

 
$
(0.68
)

(1)
Certain computations may reflect rounding adjustments.
Potentially dilutive securities include outstanding stock options, restricted stock units, and performance-based and other restricted stock units. Approximately 3 million and 2 million potentially dilutive securities for the first quarters of 2020 and 2019 were excluded from the computations of diluted net earnings per common share, as they were anti-dilutive.