Commitments and Contingent Liabilities - Litigation and Claims Involving Distribution of Controlled Substances (Narrative) (Details) $ in Millions			1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 12, 2025 USD ($)	Nov. 12, 2024 USD ($)	Jul. 31, 2025 USD ($)	Jun. 30, 2025 USD ($) case distributor jurisdiction state	Jun. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Nov. 27, 2024 USD ($)
Loss Contingencies [Line Items]
Claims and litigation charges				$ 0	$ (112)
National Prescription Opioid Litigation
Loss Contingencies [Line Items]
Loss contingency, claims settled, number of jurisdictions not participating in settlement | jurisdiction				1
National Prescription Opioid Litigation | Canada
Loss Contingencies [Line Items]
Complaints filed against the entity | case				4
An individual | National Prescription Opioid Litigation | Canada
Loss Contingencies [Line Items]
Complaints filed against the entity | case				1
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 (as a percent)				85.00%
Amounts awarded to plaintiff	$ 37	$ 192
Claims and litigation charges						$ 114	$ 149
Restricted cash in escrow						114		$ 149
National Prescription Opioid Litigation | Corporate Segment and U.S. Pharmaceutical Segment
Loss Contingencies [Line Items]
Claims and litigation charges						$ 57
National Prescription Opioid Litigation | State of Alabama and Subdivisions
Loss Contingencies [Line Items]
Settlement payment				$ 75
Award payable under proposed framework				$ 99
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 (as a percent)				0.85
National Prescription Opioid Litigation | Settling Governmental Entities and Cherokee Nation | Settled Litigation | Subsequent Event
Loss Contingencies [Line Items]
Settlement payment			$ 497
National Prescription Opioid Litigation | Three Largest U.S. Pharmaceutical Distributors
Loss Contingencies [Line Items]
Settlement payment				$ 2,000
Award payable under proposed framework				5,900
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | State of West Virginia and Subdivisions
Loss Contingencies [Line Items]
Settlement payment				68
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | State of West Virginia and Subdivisions | Settled Litigation
Loss Contingencies [Line Items]
Award payable under proposed framework				84
National Prescription Opioid Litigation | Three National Pharmaceutical Distributors | Cherokee Nation
Loss Contingencies [Line Items]
Settlement payment				112
Award payable under proposed framework				$ 84