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Business Acquisitions and Divestitures - Net Gain on Split-off of Change Healthcare JV (Details) - Change Healthcare - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 09, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2020
Business Acquisition [Line Items]        
Fair value of McKesson common stock accepted (15.4 million shares at $131.97 per share on March 9, 2020) $ 2,036      
Investment in the Change Healthcare JV at exchange date (2,096)      
Reversal of deferred tax liability 521      
Release of accumulated other comprehensive loss attributable to the joint venture (24)      
Less: Transaction costs incurred (23)      
Net gain on split-off of the Change Healthcare JV $ 414   $ 414  
Shares repurchased (in shares) 15.4      
Corporate Joint Venture        
Business Acquisition [Line Items]        
Net gain on split-off of the Change Healthcare JV     $ 414 $ (414)
Cost of shares repurchased (in usd per share)   $ 131.97