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Medical Claims and Benefits Payable - Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 1,615 $ 1,406    
Pharmacy payable 148 126    
Capitation payable 73 55    
Other 453 267    
Total $ 2,289 $ 1,854 $ 1,975 $ 1,961