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Leases - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jan. 31, 2022
Lessee, Lease, Description [Line Items]      
Operating lease expense $ 429 $ 390  
Lease liabilities reduced by cash paid 440 385  
Right-of-use assets obtained in exchange for operating lease liability 60 177  
Lease liability for leases commenced 60 177  
ROU assets 2,554 3,566  
Operating lease liability 3,313 $ 3,823  
Operating lease not yet commenced, liability 8    
ROU asset impairments 577    
Remaining asset impairment charges $ 1,627    
Weighted average remaining lease term 20 years 6 months 21 years 1 month 6 days  
Weighted average discount rate for operating leases 5.70% 5.70%  
Magellan Health      
Lessee, Lease, Description [Line Items]      
ROU assets     $ 30
Operating lease liability     $ 30
Minimum      
Lessee, Lease, Description [Line Items]      
Operating lease not yet commenced, term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Operating lease not yet commenced, term 8 years