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Medical Claims and Benefits Payable - Reconciliation of Claims Development (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Insurance [Abstract]        
Incurred claims and allocated claims adjustment expenses $ 67,438      
Less: cumulative paid claims and allocated claims adjustment expenses (64,189)      
All outstanding liabilities before 2020 9      
Non-risk and other provider payables 270      
Medical claims and benefits payable $ 3,528 $ 3,363 $ 2,696 $ 1,854