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Commitments and Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
state
lease
Aug. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
state
lease
Sep. 30, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
state
lease
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
claim
Commitments and Contingencies Disclosure [Abstract]                      
Guarantor obligations, maximum exposure $ 250     $ 250       $ 250      
Contractual obligations underlying the guaranteed benefits $ 941     $ 941       $ 941 $ 1,300    
Guarantor obligations, number of leases | lease 67     67       67      
Loss Contingencies [Line Items]                      
Opioid litigation charges               $ 5,803 $ 0 $ 0  
Number of states subject to earlier settlements | state 3     3       3      
Federal Court in Ohio Judgment | Pending Litigation                      
Loss Contingencies [Line Items]                      
Legal settlement awarded to other party   $ 651                  
Legal settlement, period of payment   15 years                  
State of Florida Settlement                      
Loss Contingencies [Line Items]                      
Legal settlement, period of payment     18 years                
Opioid litigation charges     $ 484                
Liability recorded in association with legal settlement     $ 484                
Settlement Framework                      
Loss Contingencies [Line Items]                      
Legal settlement awarded to other party $ 4,300                    
Legal settlement, period of payment 10 years     10 years       10 years      
Attorneys' fees and costs $ 625                    
Number of states that elected to join the settlement | state 45     45       45      
Settlement Framework | Tribal Entities                      
Loss Contingencies [Line Items]                      
Legal settlement awarded to other party $ 113                    
Legal settlement, period of payment 10 years     10 years       10 years      
Attorneys' fees and costs $ 18                    
Settlement Framework and Other Opioid-Related Claims                      
Loss Contingencies [Line Items]                      
Opioid litigation charges       $ 99 $ 5,200            
Long-term liability recorded in association with legal settlement $ 4,800     $ 4,800       $ 4,800      
Settlement Framework and Other Opioid-Related Claims | Maximum | Forecast                      
Loss Contingencies [Line Items]                      
Cash impact of litigation settlement           $ 500 $ 500        
Radcliff and Flaim v Aetna Inc., et al | Pending Litigation                      
Loss Contingencies [Line Items]                      
Number of claims | claim                     2