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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 15,137 $ 17,073 $ 14,774
Incurred Claims and Allocated Claims Adjustment Expenses 47,263    
Total IBNP 1,552    
Benefit Year 2016      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses 15,057 15,093 $ 15,064
Total IBNP $ 18    
Cumulative number of reported claims (in claim) | claim 105,000,000    
Benefit Year 2017      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 16,728 $ 17,037  
Total IBNP $ 57    
Cumulative number of reported claims (in claim) | claim 119,000,000    
Benefit Year 2018      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 15,478    
Total IBNP $ 1,477    
Cumulative number of reported claims (in claim) | claim 105,000,000