Commitments, Contingent Liabilities and Litigation (Details)			3 Months Ended							5 Months Ended	12 Months Ended			37 Months Ended	179 Months Ended
	Apr. 30, 2023 USD ($) lawsuit	Jul. 31, 2014	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($) plaintiff	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) states numberOfUSTerritories	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) states	Jul. 31, 2024 USD ($)	Jun. 30, 2038 USD ($)	Aug. 08, 2024 lawsuit	Nov. 30, 2023 USD ($)	Oct. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Apr. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Gain (Loss) Related to Litigation Settlement			$ (80,000,000)	$ 11,000,000	$ 41,000,000	$ 76,000,000	$ 207,000,000	$ (25,000,000)			$ (78,000,000)	$ 304,000,000	$ (94,000,000)
Income from Settlements of Class Action Lawsuits											$ 117,000,000	130,000,000	$ 18,000,000
CVS Health Corporation
Loss Contingencies [Line Items]
Long-Term Purchase Commitment, Period		10 years
Pharmaceutical and Specialty Solutions
Loss Contingencies [Line Items]
Judgment for lost profits									$ 16,000,000
Opioid Lawsuits
Loss Contingencies [Line Items]
Loss Contingency, Number of State | states											50		48
Settling U.S Territories | numberOfUSTerritories											5
Payments for Legal Settlements			239,000,000
Insurance Recoveries											$ 34,000,000
Opioid Lawsuits | Subsequent Event
Loss Contingencies [Line Items]
Payments for Legal Settlements														$ 1,900,000,000	$ 4,400,000,000
Product Liability Lawsuits
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)												103,000,000
Product Liability Lawsuits | IVC April 2023 Agreement
Loss Contingencies [Line Items]
Payments for Legal Settlements										$ 275,000,000
Loss Contingency, Estimate of Possible Loss	$ 275,000,000
New York Opioid Stewardship Act
Loss Contingencies [Line Items]
Aggregate Annual Assessment																					$ 100,000,000
Loss contingency accrual												3,000,000	$ 20,000,000							$ 41,000,000
Loss Contingency Accrual, Period Increase (Decrease)												6,000,000
Loss Contingency Accrual, Payments									$ 20,000,000			$ 11,000,000
WEST VIRGINIA | Opioid Lawsuits
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss																			$ 124,000,000
921150 American Indian and Alaska Native Tribal Governments | Opioid Lawsuits
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss																		$ 136,000,000
ALABAMA | Opioid Lawsuits
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss																	$ 123,000,000
Litigation Settlement, Loss											22,000,000
Total Opioid Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)			344,000,000								344,000,000
Estimated Litigation Liability											5,400,000,000
Estimated Litigation Liability, Current											643,000,000
Litigation settlement													$ 5,630,000,000
Litigation Settlement, Loss											340
Income As A Result Of Prepayments			$ 105,000,000								105,000,000
Private Parties [Member] | Opioid Lawsuits | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number | lawsuit																371
Private Parties [Member] | GEORGIA | Opioid Lawsuits
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff						21
Class Action Lawsuits [Member] | Private Parties [Member] | Opioid Lawsuits
Loss Contingencies [Line Items]
Estimated Litigation Liability											213,000,000
Class Action Lawsuits [Member] | Private Parties [Member] | Opioid Lawsuits | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Lawsuits, Number | lawsuit																98
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											$ 291,000,000