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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 2,486 $ 1,647 $ 1,406  
Pharmacy payable 219 157 126  
Capitation payable 82 70 55  
Other 576 528 267  
Total 3,363 2,696 1,854 $ 1,961
Magellan Complete Care acquisition opening balance        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Total $ 0 $ 294 $ 0