XML 46 R33.htm IDEA: XBRL DOCUMENT v3.20.2
Significant Accounting Policies - Quality Incentive Premium Revenue Recognized (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule of Premium Revenue by Health Plan Type [Line Items]        
Maximum available quality incentive premium - current period $ 69 $ 47 $ 195 $ 138
Quality incentive premium revenue recognized in current period:        
Earned current period 63 46 180 109
Earned prior periods 19 5 23 35
Total $ 82 $ 51 $ 203 $ 144
Quality incentive premium revenue recognized as a percentage of total premium revenue 1.70% 1.20% 1.50% 1.20%
Select health plans | Minimum        
Schedule of Premium Revenue by Health Plan Type [Line Items]        
Percentage of additional incremental revenue earned     1.00%  
Select health plans | Maximum        
Schedule of Premium Revenue by Health Plan Type [Line Items]        
Percentage of additional incremental revenue earned     4.00%