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Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]  
Receivables (payables) for 3R programs
Our receivables (payables) for each of these programs, as of the dates indicated, were as follows:
 
June 30, 2017
 
December 31,
2016
 
Current Benefit Year
 
Prior Benefit Years
 
Total
 
 
 
 
 
 
 
 
 
 
(In millions)
Risk adjustment
$
(502
)
 
$
(546
)
 
$
(1,048
)
 
$
(522
)
Reinsurance
—

 
57

 
57

 
55

Risk corridor
—

 
(1
)
 
(1
)
 
(1
)
Minimum MLR
(3
)
 
(2
)
 
(5
)
 
(1
)
Quality incentive premium revenue recognized
The following table quantifies the quality incentive premium revenue recognized for the periods presented, including the amounts earned in the periods presented and prior periods. Although the reasonably possible effects of a change in estimate related to quality incentive premium revenue as of June 30, 2017 are not known, we have no reason to believe that the adjustments to prior years noted below are not indicative of the potential future changes in our estimates as of June 30, 2017.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(Dollars in millions)
Maximum available quality incentive premium - current period
$
39

 
$
41

 
$
77

 
$
81

Quality incentive premium revenue recognized in current period:
 
 
 
 
 
 
 
Earned current period
$
29

 
$
36

 
$
48

 
$
54

Earned prior periods
1

 
49

 
6

 
54

Total
$
30

 
$
85

 
$
54

 
108

 
 
 
 
 
 
 
 
Quality incentive premium revenue recognized as a percentage of total premium revenue
0.6
%
 
2.1
%
 
0.6
%
 
1.3
%