Commitments and Contingent Liabilities - Narrative (Details) $ in Millions								1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 26, 2022 USD ($)	Jul. 05, 2022 USD ($)	Jun. 27, 2022 USD ($)	May 03, 2022 USD ($)	Apr. 02, 2022 USD ($) state installment distributor	Sep. 28, 2021 USD ($)	Dec. 09, 2019 city state	Oct. 31, 2022 USD ($)	Sep. 30, 2022 USD ($) case	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) case	Sep. 30, 2021 USD ($)	Mar. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Estimated probable loss and expected loss recovery									$ 141		$ 141
Proceeds from legal settlements										$ 34		$ 46
Probable loss recovery									$ 141		$ 141
Subsequent Event | Operating Segments | U.S. Pharmaceutical
Loss Contingencies [Line Items]
Proceeds from legal settlements								$ 129
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					46
Number of eligible states | state					49
Award payable under proposed framework					$ 7,400
Portion of settlement to be paid by the Company (percent)					38.10%
Portion of settlement award to be used by state and local government for remediation (percent)					85.00%
Loss contingency, number of cases dismissed | case									2,000		2,000
Restricted cash									$ 35		$ 35		$ 395
National Prescription Opioid Litigation | State of West Virginia and Subdivisions
Loss Contingencies [Line Items]
Award payable under proposed framework		$ 152
National Prescription Opioid Litigation | Cherokee Nation
Loss Contingencies [Line Items]
Award payable under proposed framework						$ 29
Portion of settlement to be paid by the Company (percent)						38.10%
Loss contingency, settlement, installment payments, term						6 years 6 months
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 | Native American Tribes Other Than Cherokee Nation | Subsequent Event
Loss Contingencies [Line Items]
Award payable under proposed framework	$ 167
Portion of settlement to be paid by the Company (percent)	38.10%
Loss contingency, settlement, installment payments, term	6 years
United States ex rel. Omni Healthcare, Inc. v. US Oncology, Inc., 19-cv-05125
Loss Contingencies [Line Items]
Loss contingency, number of states filed on behalf of | state							30
Loss contingency number of cities filed on behalf of | city							2
Canada | National Prescription Opioid Litigation
Loss Contingencies [Line Items]
Complaints filed against the entity | case									4		4
Canada | National Prescription Opioid Litigation | Governmental entities
Loss Contingencies [Line Items]
Complaints filed against the entity | case									3		3
Canada | National Prescription Opioid Litigation | An individual
Loss Contingencies [Line Items]
Complaints filed against the entity | case									1		1
Three Largest U.S. Pharmaceutical Distributors | National Prescription Opioid Litigation
Loss Contingencies [Line Items]
Award payable under proposed framework					$ 19,500
Period over which award would be payable under proposed framework					18 years
Three National Pharmaceutical Distributors | National Prescription Opioid Litigation | State of West Virginia and Subdivisions
Loss Contingencies [Line Items]
Award payable under proposed framework		$ 400
Portion of settlement to be paid by the Company (percent)		38.10%
Loss contingency, settlement, installment payments, term		11 years
Three National Pharmaceutical Distributors | National Prescription Opioid Litigation | Cherokee Nation
Loss Contingencies [Line Items]
Award payable under proposed framework						$ 75
Three National Pharmaceutical Distributors | National Prescription Opioid Litigation | Native American Tribes Other Than Cherokee Nation | Subsequent Event
Loss Contingencies [Line Items]
Award payable under proposed framework	$ 440
Pending | National Prescription Opioid Litigation | State of Alabama and Subdivisions
Loss Contingencies [Line Items]
Award payable under proposed framework					$ 141
Loss contingency, settlement, number of installment payments | installment					10
Litigation expense					$ 33
Settled Litigation | National Prescription Opioid Litigation | State of Washington and Subdivisions
Loss Contingencies [Line Items]
Award payable under proposed framework				$ 197
Portion of settlement to be paid by the Company (percent)				38.10%
Settled Litigation | National Prescription Opioid Litigation | State of Oklahoma and Subdivisions
Loss Contingencies [Line Items]
Award payable under proposed framework			$ 117
Portion of settlement to be paid by the Company (percent)			38.10%
Settled Litigation | National Prescription Opioid Litigation | Settling Governmental Entities
Loss Contingencies [Line Items]
Settlement payment											$ 406
Escrow deposit									$ 45		45
Settled Litigation | National Prescription Opioid Litigation | Settling Governmental Entities and Cherokee Nation
Loss Contingencies [Line Items]
Settlement payment									$ 535		$ 910
Settled Litigation | Distributors | National Prescription Opioid Litigation | State of Washington and Subdivisions
Loss Contingencies [Line Items]
Award payable under proposed framework				$ 518
Period over which award would be payable under proposed framework				18 years
Settled Litigation | Distributors | National Prescription Opioid Litigation | State of Oklahoma and Subdivisions
Loss Contingencies [Line Items]
Award payable under proposed framework			$ 308
Period over which award would be payable under proposed framework			18 years