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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 2,597 $ 2,486 $ 1,647  
Pharmacy payable 206 219 157  
Capitation payable 94 82 70  
Other 631 576 528  
Total 3,528 3,363 2,696 $ 1,854
Magellan Complete Care acquisition opening balance        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total $ 0 $ 0 $ 294