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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