Commitments, Contingent Liabilities and Litigation (Details) $ in Millions			3 Months Ended			5 Months Ended	9 Months Ended		12 Months Ended	40 Months Ended	176 Months Ended
	Apr. 30, 2023 USD ($) lawsuit	Jul. 31, 2014	Mar. 31, 2025 USD ($) states numberOfUSTerritories	Mar. 31, 2024 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2025 USD ($) states numberOfUSTerritories	Mar. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Oct. 31, 2024 USD ($)	Dec. 31, 2038 USD ($)	Apr. 29, 2025 lawsuit	Aug. 31, 2024 USD ($)	Nov. 30, 2023 USD ($)	Oct. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Apr. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Income from Settlements of Class Action Lawsuits			$ 106	$ 6			$ 165	$ 77
Product Liability Lawsuits | IVC April 2023 Agreement
Loss Contingencies [Line Items]
Loss Contingency, Claims Settled, Number | lawsuit	4,375
Product Liability Lawsuits | Minimum
Loss Contingencies [Line Items]
Loss Contingency Accrual			85				85
Total Opioid Litigation [Member]
Loss Contingencies [Line Items]
Estimated Litigation Liability			4,900				4,900
Estimated Litigation Liability, Current			$ 636				$ 636
Litigation Settlement, Loss									$ 340
Income As A Result Of Prepayments									105
Loss Contingency Accrual, Period Increase (Decrease)									344
New York Opioid Stewardship Act [Member]
Loss Contingencies [Line Items]
Aggregate Annual Assessment																	$ 100
Opioid Lawsuits [Member]
Loss Contingencies [Line Items]
Settling States | states			48				48
Settling U.S Territories | numberOfUSTerritories			5				5
Payments for Legal Settlements										$ 1,900
Insurance Recoveries							$ 25		34
Opioid Lawsuits [Member] | Subsequent Event
Loss Contingencies [Line Items]
Payments for Legal Settlements											$ 4,400
Opioid Lawsuits [Member] | WEST VIRGINIA
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss																$ 124
Opioid Lawsuits [Member] | ALABAMA
Loss Contingencies [Line Items]
Litigation Settlement, Loss									$ 22
Loss Contingency, Estimate of Possible Loss														$ 123
Opioid Lawsuits [Member] | Native American tribes
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss															$ 136
Opioid Lawsuits [Member] | City of Baltimore
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss													$ 153
Opioid Lawsuits [Member] | Private Parties [Member] | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number | lawsuit												330
Opioid Lawsuits [Member] | Class Action Lawsuits [Member] | Private Parties [Member]
Loss Contingencies [Line Items]
Estimated Litigation Liability			$ 213				$ 213
Opioid Lawsuits [Member] | Class Action Lawsuits [Member] | Private Parties [Member] | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number | lawsuit												100
Product Liability Lawsuits
Loss Contingencies [Line Items]
Product Liability Accrual, Period Expense					$ (103)
Product Liability Lawsuits | IVC April 2023 Agreement
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 275
Payments for Legal Settlements					$ 74	$ 275
CVS Health
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Period		10 years