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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Insurance [Abstract]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 2,901 $ 2,597 $ 2,486  
Pharmacy payable 202 206 219  
Capitation payable 100 94 82  
Other 1,001 631 576  
Medical claims and benefits payable $ 4,204 $ 3,528 $ 3,363 $ 2,696