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Medical Claims and Benefits Payable - Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 1,432 $ 1,406    
Pharmacy payable 132 126    
Capitation payable 74 55    
Other 322 267    
Total $ 1,960 $ 1,854 $ 1,767 $ 1,961