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Medical Claims and Benefits Payable - Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 2,246 $ 1,647    
Pharmacy payable 209 157    
Capitation payable 86 70    
Other 650 528    
Total 3,191 2,696 $ 2,289 $ 1,854
Magellan complete care        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total $ 0 $ 294