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Commitments, Contingent Liabilities and Litigation Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 04, 2021 lawsuit StateAG plaintiff | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Gain (Loss) Related to Litigation Settlement |  | $ (18) | $ (1,038) |
Opioid Lawsuits [Member] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Lawsuits, Number | lawsuit | 3,300 |  |  |
Lawsuits Against Distributors | StateAG | 25 |  |  |
Product Liability Lawsuits [Member] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, New Claims Filed, Number | lawsuit | 33 |  |  |
Loss Contingency, Claims Settled, Number | lawsuit | 1,300 |  |  |
New York Opioid Stewardship Act [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Aggregate Annual Assessment |  | $ 100 |  |
Estimated Liability for New York Opioid Stewardship Act |  |  | 41 |
Opioid Lawsuits State [Domain] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Lawsuits, Number | lawsuit | 2,900 |  |  |
DOJ Investigation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Gain (Loss) Related to Litigation Settlement |  |  |  | $ 13
CVS Health |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Long-term Purchase Commitment, Period |  | 10 years |  |
Product Liability Lawsuits [Member] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, New Claims Filed, Number | lawsuit | 434 |  |  |
Minimum | Product Liability Lawsuits [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual |  | $ 547 |  |
Alameda County [Member] | Product Liability Lawsuits [Member] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, New Claims Filed, Number | plaintiff | 5,614 |  |  |
Other Jurisdictions [Member] | Product Liability Lawsuits [Member] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, New Claims Filed, Number | plaintiff | 38 |  |  |
Total Opioid Litigation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
litigation settlement liability recorded |  | 6,680 |  |
Litigation Charges |  |  | $ 1,020 |
Loss Contingency, Estimate of Possible Loss |  | 6,370 |  |
Total Opioid Litigation [Member] | Accrued Liabilities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
litigation settlement liability recorded |  | 441 |  |
Private Parties [Member] | Opioid Lawsuits [Member] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Lawsuits, Number | lawsuit | 446 |  |  |
Class Action Lawsuits [Member] | Private Parties [Member] | Opioid Lawsuits [Member] | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Lawsuits, Number | lawsuit | 129 |  |  |
Product Liability Lawsuits [Member] | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual |  | $ 1,070 |  |

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