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Earnings Per Common Share (Tables)
 12 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per common share
The computations for basic and diluted earnings per common share are as follows:
 
Years Ended March 31,
(In millions, except per share amounts)
2020
 
2019
 
2018
Income from continuing operations
$
1,126

 
$
254

 
$
292

Net income attributable to noncontrolling interests
(220
)
 
(221
)
 
(230
)
Income from continuing operations attributable to McKesson
906

 
33

 
62

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

 
5

Net income attributable to McKesson
$
900

 
$
34

 
$
67

 
 
 
 
 
 
Weighted average common shares outstanding:
 
 
 
 
 
Basic
181

 
196

 
208

Effect of dilutive securities:
 
 
 
 
 
Restricted stock units
1

 
1

 
1

Diluted
182

 
197

 
209

 
 
 
 
 
 
Earnings (loss) per common share attributable to McKesson: (1)
 
 
 
 
 
Diluted
 
 
 
 
 
Continuing operations
$
4.99

 
$
0.17

 
$
0.30

Discontinued operations
(0.04
)
 
—

 
0.02

Total
$
4.95

 
$
0.17

 
$
0.32

Basic
 
 
 
 
 
Continuing operations
$
5.01

 
$
0.17

 
$
0.30

Discontinued operations
(0.03
)
 
—

 
0.02

Total
$
4.98

 
$
0.17

 
$
0.32


(1)
Certain computations may reflect rounding adjustments.