Commitments and Contingent Liabilities - Narrative (Details)				6 Months Ended
	Apr. 27, 2022 USD ($)	Oct. 08, 2021 plaintiff	May 17, 2013 USD ($)	Sep. 30, 2023 USD ($) jurisdiction case distributor state	Dec. 09, 2019 state city	Aug. 13, 2019 fax faxNumber
Loss Contingencies [Line Items]
Number of investment funds | plaintiff		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				$ 529,000,000
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				$ 61,000,000
Award payable under proposed framework				$ 113,000,000
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				$ 1,500,000,000
Award payable under proposed framework				6,300,000,000
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | State of West Virginia and Subdivisions
Loss Contingencies [Line Items]
Settlement payment				38,000,000
Award payable under proposed framework				114,000,000
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | Cherokee Nation
Loss Contingencies [Line Items]
Settlement payment				84,000,000
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | Native American Tribes Other Than Cherokee Nation
Loss Contingencies [Line Items]
Award payable under proposed framework				$ 112,000,000
United States Ex Rel Omni Healthcare Inc V U S Oncology Inc19 Cv05125
Loss Contingencies [Line Items]
Number of states filed on behalf of | state					30
Number of cities filed on behalf of | city					2
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al
Loss Contingencies [Line Items]
Loss contingency, class action, number of faxes remaining in the class | faxNumber						9,490
Loss contingency, class action, number of faxes received | fax						48,769
Amounts awarded to plaintiff	$ 6,500
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Minimum
Loss Contingencies [Line Items]
Loss contingency, damages sought per violation, value			$ 500
True Health Chiropractic Inc., et al. v. McKesson Corporation, et al | Maximum
Loss Contingencies [Line Items]
Loss contingency, damages sought per violation, value			$ 1,500