Earnings per Common Share (Tables)

12 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Schedule of basic and diluted earnings per common share

The computations for basic and diluted earnings or loss per common share are as follows:

	Years Ended March 31,
(In millions, except per share amounts)	2021		2020		2019
Income (loss) from continuing operations	$	(4,339)	$	1,126	$	254
Net income attributable to noncontrolling interests	(199)		(220)		(221)
Income (loss) from continuing operations attributable to McKesson	(4,538)		906		33
Income (loss) from discontinued operations, net of tax	(1)		(6)		1
Net income (loss) attributable to McKesson	$	(4,539)	$	900	$	34
Weighted-average common shares outstanding:
Basic	160.6		180.6		196.3
Effect of dilutive securities:
Restricted stock units	—		1.0		1.0
Diluted	160.6		181.6		197.3
Earnings (loss) per common share attributable to McKesson: (1)
Diluted
Continuing operations	$	(28.26)	$	4.99	$	0.17
Discontinued operations	—		(0.04)		—
Total	$	(28.26)	$	4.95	$	0.17
Basic
Continuing operations	$	(28.26)	$	5.01	$	0.17
Discontinued operations	—		(0.03)		—
Total	$	(28.26)	$	4.98	$	0.17

(1)Certain computations may reflect rounding adjustments.