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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 14,774 $ 11,794 $ 8,077
Incurred Claims and Allocated Claims Adjustment Expenses 35,130    
Total IBNP 1,352 1,191 871
Benefit Year 2014      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses 8,138 8,139 $ 8,284
Total IBNP $ 3    
Cumulative number of reported claims (in claim) | claim 57,000,000    
Benefit Year 2015      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 11,928 $ 12,113  
Total IBNP $ 22    
Cumulative number of reported claims (in claim) | claim 83,000,000    
Benefit Year 2016      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 15,064    
Total IBNP $ 1,327    
Cumulative number of reported claims (in claim) | claim 102,000,000