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Commitments and Contingent Liabilities - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Jul. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
distributor
case
state
jurisdiction
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jul. 31, 2020
state
Dec. 12, 2018
officer
Loss Contingencies [Line Items]            
Number of former officers | officer           2
National Prescription Opioid Litigation | United States            
Loss Contingencies [Line Items]            
Complaints filed against the entity | case   400        
National Prescription Opioid Litigation | Canada            
Loss Contingencies [Line Items]            
Complaints filed against the entity | case   4        
National Prescription Opioid Litigation | An individual | Canada            
Loss Contingencies [Line Items]            
Complaints filed against the entity | case   1        
Settled Litigation | National Prescription Opioid Litigation            
Loss Contingencies [Line Items]            
Settlement payment   $ 0        
Settled Litigation | National Prescription Opioid Litigation | Subsequent Event            
Loss Contingencies [Line Items]            
Settlement payment $ 529          
National Prescription Opioid Litigation            
Loss Contingencies [Line Items]            
Number of other national distributors named in suit | distributor   2        
Number of states in which court cases are pending | state   48        
Loss contingency, number of cases dismissed | case   2,300        
Portion of settlement award to be used by state and local government for remediation (percent)   85.00%        
Loss contingency, claims settled, number of jurisdictions not participating in settlement | jurisdiction   1        
National Prescription Opioid Litigation | State of Alabama and Subdivisions            
Loss Contingencies [Line Items]            
Settlement payment   $ 42        
Award payable under proposed framework   $ 132        
National Prescription Opioid Litigation | Native American Tribes Other Than Cherokee Nation            
Loss Contingencies [Line Items]            
Litigation settlement, amount awarded to other party, percentage of total settlement to be used to remediate damages   0.85        
National Prescription Opioid Litigation | Three Largest U.S. Pharmaceutical Distributors            
Loss Contingencies [Line Items]            
Settlement payment   $ 1,000        
Award payable under proposed framework   6,800        
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | State of West Virginia and Subdivisions            
Loss Contingencies [Line Items]            
Settlement payment   38        
Award payable under proposed framework   114        
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | Cherokee Nation            
Loss Contingencies [Line Items]            
Settlement payment   56        
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | Native American Tribes Other Than Cherokee Nation            
Loss Contingencies [Line Items]            
Award payable under proposed framework   $ 140        
Evanston Police Pension Fund v. McKesson Corporation            
Loss Contingencies [Line Items]            
Loss contingency, estimate of possible loss     $ 141 $ 141    
Probable loss recovery     $ 141 $ 141    
United States Ex Rel. Hart V. McKesson Corporation, Et Al 15-CV-00903-RA            
Loss Contingencies [Line Items]            
Number of states filed on behalf of | state         27