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Medical Claims and Benefits Payable - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Insurance [Abstract]      
Non-risk provide payables $ 228 $ 226 $ 235
Prior period claims, favorable development $ (284) $ (239) $ (119)