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Commitments and Contingent Liabilities - Narrative (Details)
3 Months Ended 6 Months Ended 23 Months Ended
May 17, 2013
USD ($)
Sep. 30, 2019
USD ($)
state_attorney
state
county
case
Sep. 30, 2019
USD ($)
state_attorney
state
county
case
Sep. 30, 2019
state_attorney
state
county
case
Oct. 01, 2019
pharmacy
complaint
Dec. 30, 2017
investment_fund
Oct. 09, 2017
case
In re: National Prescription Opioid Litigation              
Loss Contingencies [Line Items]              
Complaints filed against the entity   2,300 2,300 2,300      
Pre-tax charge | $     $ (82,000,000)        
Related to Two Counties              
Loss Contingencies [Line Items]              
Pre-tax charge | $   $ 82,000,000          
Number of counties | county   2 2 2      
In re McKesson Corporation Stockholder Derivative Litigation [Member]              
Loss Contingencies [Line Items]              
Complaints filed against the entity             2
Number of additional suits filed       4      
Police & Fire Ret. Sys. of the City of Detroit v. McKesson Corporation, et al., Amalgamated Bank v. McKesson Corporation, et al., and Greene v. McKesson Corporation, et al.              
Loss Contingencies [Line Items]              
Number of additional suits filed       3      
Davidson Kempner International (BVI) Ltd., et al. v. McKesson Europe Holdings GmbH & Co. KGaA              
Loss Contingencies [Line Items]              
Number of investment funds | investment_fund           4  
Minimum | True Health Chiropractic Inc., et al. v. McKesson Corporation, et al.              
Loss Contingencies [Line Items]              
Damages sought per violation | $ $ 500            
Maximum | True Health Chiropractic Inc., et al. v. McKesson Corporation, et al.              
Loss Contingencies [Line Items]              
Damages sought per violation | $ $ 1,500            
Subsequent Event [Member] | Powell Prescription Center, et al. v. Surescripts, LLC, et al., and Intergrated Pharmaceutical Solutions LLC v. Surescripts, LLC              
Loss Contingencies [Line Items]              
Complaints filed against the entity | complaint         3    
Number of pharmacies | pharmacy         6    
Pending              
Loss Contingencies [Line Items]              
Complaints filed against the entity   370 370 370      
Number of states | state   37 37 37      
Number of state attorney generals | state_attorney   19 19 19