XML 61 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1
Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]        
Fee-for-service claims incurred but not paid (IBNP) $ 1,510 $ 1,717    
Pharmacy payable 116 112    
Capitation payable 49 67    
Other 245 296    
Medical claims and benefits payable $ 1,920 $ 2,192 $ 2,077 $ 1,929