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Medical Claims and Benefits Payable - Medical Claims and Future Benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Insurance [Abstract]        
Fee-for-service claims incurred but not paid (“IBNP”) $ 1,562 $ 1,717 $ 1,352  
Pharmacy payable 115 112 112  
Capitation payable 52 67 37  
Other 232 296 428  
Medical claims and benefits payable $ 1,961 $ 2,192 $ 1,929 $ 1,685