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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
lease
Mar. 31, 2021
USD ($)
Dec. 31, 2012
member
Sep. 30, 2020
claim
Commitments and Contingencies Disclosure [Abstract]        
Guarantor obligations, number of leases | lease 68      
Sample size | member     200  
Loss Contingencies [Line Items]        
Legal settlement accrual $ 484 $ 0    
State of Florida Settlement        
Loss Contingencies [Line Items]        
Legal settlement accrual $ 484      
Legal settlement, period of payment 18 years      
Liability recorded in association with pending legal settlement $ 484      
Radcliffe and Flaim v. Aetna Inc., et al | Pending Litigation        
Loss Contingencies [Line Items]        
Number of claims | claim       2