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Significant Accounting Policies (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Depreciation and amortization  
The following table presents all depreciation and amortization recorded in our consolidated statements of income, regardless of whether the item appears as depreciation and amortization, a reduction of revenue, or as cost of service revenue.
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(In millions)
Depreciation, and amortization of capitalized software, continuing operations
$
87

 
$
75

 
$
55

Amortization of intangible assets, continuing operations
17

 
18

 
18

Depreciation and amortization, continuing operations
104

 
93

 
73

Amortization recorded as reduction of service revenue
1

 
3

 
3

Amortization of capitalized software recorded as cost of service revenue
21

 
38

 
18

Depreciation and amortization reported in the statement of cash flows
$
126

 
$
134

 
$
94
Summarized premium revenue  
The following table summarizes premium revenue from continuing operations for the periods indicated:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
Amount
 
% of Total
 
Amount
 
% of Total
 
Amount
 
% of Total
 
(Dollars in millions)
California
$
2,200

 
16.6
%
 
$
1,523

 
16.9
%
 
$
750

 
12.1
%
Florida
1,199

 
9.0

 
439

 
4.9

 
265

 
4.3

Illinois
397

 
3.0

 
153

 
1.7

 
8

 
0.1

Michigan
1,067

 
8.1

 
781

 
8.7

 
676

 
11.0

New Mexico
1,237

 
9.3

 
1,076

 
11.9

 
447

 
7.2

Ohio
2,034

 
15.4

 
1,553

 
17.2

 
1,099

 
17.8

Puerto Rico
567

 
4.3

 
—

 
—

 
—

 
—

South Carolina
348

 
2.6

 
381

 
4.2

 
—

 
—

Texas
1,961

 
14.8

 
1,318

 
14.6

 
1,291

 
20.9

Utah
331

 
2.5

 
310

 
3.4

 
311

 
5.0

Washington
1,602

 
12.1

 
1,305

 
14.5

 
1,168

 
18.9

Wisconsin
261

 
2.0

 
156

 
1.7

 
143

 
2.3

Direct delivery
37

 
0.3

 
28

 
0.3

 
21

 
0.4

 
$
13,241

 
100.0
%
 
$
9,023

 
100.0
%
 
$
6,179

 
100.0
%
Receivables (payables) for 3R programs
Our receivables (payables) for each of these programs, as of the dates indicated, were as follows:
 
June 30, 2016
 
December 31,
2015
 
Current Benefit Year
 
Prior Benefit Years
 
Total
 
 
(In millions)
Risk adjustment
$
(220
)
 
$
(254
)
 
$
(474
)
 
$
(214
)
Reinsurance
57

 
24

 
81

 
36

Risk corridor
(9
)
 
(3
)
 
(12
)
 
(10
)
Minimum MLR
(17
)
 
(2
)
 
(19
)
 
(3
)
Our receivables (payables) for each of these programs, as of the dates indicated, were as follows (in millions):
 
December 31, 2015
 
December 31, 2014
Risk adjustment
$
(214
)
 
$
(5
)
Reinsurance
36

 
5

Risk corridor
(10
)
 
—

Minimum MLR
(3
)
 
—
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, 2016 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, 2016, other than the Texas quality revenue recognized in the second quarter of 2016 described above.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(In millions)
Maximum available quality incentive premium - current period
$
41

 
$
28

 
$
81

 
$
58

Amount of quality incentive premium revenue recognized in current period:
 
 
 
 
 
 
 
Earned current period
$
36

 
$
11

 
$
54

 
$
21

Earned prior periods
49

 
11

 
54

 
11

Total
$
85

 
$
22

 
$
108

 
32

 
 
 
 
 
 
 
 
Quality incentive premium revenue recognized as a percentage of total premium revenue
2.1
%
 
0.7
%
 
1.3
%
 
0.5
%
The following table quantifies the quality incentive premium revenue recognized for the periods presented, including the amounts earned in the period presented and prior periods. Although the reasonably possible effects of a change in estimate related to quality incentive premium revenue as of December 31, 2015 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 December 31, 2015.
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(In millions)
Maximum available quality incentive premium - current period
$
118

 
$
90

 
$
63

 
 
 
 
 
 
Amount of quality incentive premium revenue recognized in current period:
 
 
 
 
 
Earned current period
$
66

 
$
40

 
$
46

Earned prior periods
13

 
4

 
9

Total
$
79

 
$
44

 
$
55

 
 
 
 
 
 
Total premium revenue recognized for state health plans with quality incentive premiums
$
11,107

 
$
7,084

 
$
2,980
Consolidated medical care costs  
The following table provides the details of our consolidated medical care costs from continuing operations for the periods indicated (dollars in millions, except PMPM amounts): 
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
Amount
 
PMPM
 
% of
Total
 
Amount
 
PMPM
 
% of
Total
 
Amount
 
PMPM
 
% of
Total
Fee-for-service
$
8,572

 
$
218.35

 
72.7
%
 
$
5,673

 
$
202.87

 
70.2
%
 
$
3,612

 
$
160.43

 
67.1
%
Pharmacy
1,610

 
41.01

 
13.7

 
1,273

 
45.54

 
15.8

 
935

 
41.54

 
17.4

Capitation
982

 
25.02

 
8.3

 
748

 
26.77

 
9.3

 
604

 
26.83

 
11.2

Direct delivery
128

 
3.26

 
1.1

 
96

 
3.44

 
1.2

 
48

 
2.14

 
0.9

Other
502

 
12.79

 
4.2

 
286

 
10.22

 
3.5

 
181

 
8.05

 
3.4

Total
$
11,794

 
$
300.43

 
100.0
%
 
$
8,076

 
$
288.84

 
100.0
%
 
$
5,380

 
$
238.99

 
100.0
%