XML 59 R47.htm IDEA: XBRL DOCUMENT v3.19.1
Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 1,411 $ 1,562    
Pharmacy payable 114 115    
Capitation payable 59 52    
Other 411 232    
Medical claims and benefits payable $ 1,995 $ 1,961 $ 2,023 $ 2,192