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Subsequent Event (Details) - U.S. Department of Health and Human Services, ACA Risk Corridor Receivables - USD ($)
$ in Millions
Oct. 22, 2020
Dec. 31, 2020
Aug. 31, 2019
Pending Litigation      
Subsequent Event [Line Items]      
Gain contingency, unrecorded amount     $ 313
Pending Litigation | Subsequent Event      
Subsequent Event [Line Items]      
Amount awarded from other party $ 313    
Settled Litigation | Premium Revenue | Forecast      
Subsequent Event [Line Items]      
Former gain contingency, recognized in current period, before tx   $ 305  
Former gain contingency, recognized in current period, net of tax   $ 220