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Earnings Per Common Share (Tables)
 3 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of computations for basic and diluted earnings per common share
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)
2018
 
2017
Income (loss) from continuing operations
$
(81
)
 
$
363

Net income attributable to noncontrolling interests
(58
)
 
(56
)
Income (loss) from continuing operations attributable to McKesson
(139
)
 
307

Income from discontinued operations, net of tax
1

 
2

Net income (loss) attributable to McKesson
$
(138
)
 
$
309

 
 
 
 
Weighted average common shares outstanding:
 
 
 
Basic
202

 
211

Effect of dilutive securities:
 
 
 
Options to purchase common stock
—

 
1

Restricted stock units
—

 
1

Diluted
202

 
213

 
 
 
 
Earnings (loss) per common share attributable to McKesson: (1)
 
 
 
Diluted
 
 
 
Continuing operations
$
(0.69
)
 
$
1.44

Discontinued operations
0.01

 
0.01

Total
$
(0.68
)
 
$
1.45

Basic
 
 
 
Continuing operations
$
(0.69
)
 
$
1.46

Discontinued operations
0.01

 
—

Total
$
(0.68
)
 
$
1.46


(1)
Certain computations may reflect rounding adjustments.