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Condensed Financial Information of Registrant - Notes to Condensed Financial Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]      
Medicaid $ 34,072 $ 31,974 $ 27,771
Parent Company      
Related Party Transaction [Line Items]      
Medicaid 2,065 1,834 1,507
Parent Company | Affiliated Entity      
Related Party Transaction [Line Items]      
Medicaid $ 2,038 $ 1,826 $ 1,496