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Earnings (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Income from continuing operations $ 536 $ 495
Net income attributable to noncontrolling interests (47) (50)
Income from continuing operations attributable to McKesson Corporation 489 445
Loss from discontinued operations, net of tax (3) (1)
Net income attributable to McKesson Corporation $ 486 $ 444
Weighted-average common shares outstanding:    
Basic (in shares) 156.2 162.0
Effect of dilutive securities:    
Diluted (in shares) 158.1 163.2
Diluted    
Continuing operations (in dollars per share) $ 3.09 $ 2.72
Discontinued operations (in dollars per share) (0.02) 0
Total (in dollars per share) 3.07 2.72
Basic    
Continuing operations (in dollars per share) 3.13 2.74
Discontinued operations (in dollars per share) (0.02) 0
Total (in dollars per share) $ 3.11 $ 2.74
Potentially dilutive securities (shares) 1.0 3.0
Stock options    
Effect of dilutive securities:    
Restricted stock units (in shares) 0.1 0.0
Restricted stock units    
Effect of dilutive securities:    
Restricted stock units (in shares) 1.8 1.2