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Earnings Per Common Share (Tables)
 12 Months Ended
Mar. 31, 2018
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)
2018
 
2017
 
2016
Income from continuing operations
$
292

 
$
5,277

 
$
2,342

Net income attributable to noncontrolling interests
(230
)
 
(83
)
 
(52
)
Income from continuing operations attributable to McKesson
62

 
5,194

 
2,290

Income (Loss) from discontinued operations, net of tax
5

 
(124
)
 
(32
)
Net income attributable to McKesson
$
67

 
$
5,070

 
$
2,258

 
 
 
 
 
 
Weighted average common shares outstanding:
 
 
 
 
 
Basic
208

 
221

 
230

Effect of dilutive securities:
 
 
 
 
 
Options to purchase common stock
—

 
1

 
1

Restricted stock units
1

 
1

 
2

Diluted
209

 
223

 
233

 
 
 
 
 
 
Earnings (loss) per common share attributable to McKesson: (1)
 
 
 
 
 
Diluted
 
 
 
 
 
Continuing operations
$
0.30

 
$
23.28

 
$
9.84

Discontinued operations
0.02

 
(0.55
)
 
(0.14
)
Total
$
0.32

 
$
22.73

 
$
9.70

Basic
 
 
 
 
 
Continuing operations
$
0.30

 
$
23.50

 
$
9.96

Discontinued operations
0.02

 
(0.55
)
 
(0.14
)
Total
$
0.32

 
$
22.95

 
$
9.82


(1)
Certain computations may reflect rounding adjustments.