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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Summary of quarterly results of operations
The following table summarizes quarterly unaudited results of operations for the years ended December 31, 2016 and 2015.
 
For The Quarter Ended
 
March 31,
2016
 
June 30,
2016
 
Sept. 30, 2016
 
December 31,
2016
 
(In millions, except per-share data)
Premium revenue
$
3,995

 
$
4,029

 
$
4,191

 
$
4,177

Service revenue
140

 
135

 
133

 
131

Operating income (loss)
89

 
105

 
118

 
(6
)
Net income (loss)
24

 
33

 
42

 
(47
)
Net income (loss) per share (1):
 
 
 
 
 
 
 
Basic
$
0.44

 
$
0.58

 
$
0.77

 
$
(0.85
)
Diluted
$
0.43

 
$
0.58

 
$
0.76

 
$
(0.85
)
 
For The Quarter Ended
 
March 31,
2015
 
June 30,
2015
 
Sept. 30, 2015
 
December 31,
2015
 
(In millions, except per-share data)
Premium revenue
$
2,971

 
$
3,304

 
$
3,377

 
$
3,589

Service revenue
52

 
47

 
47

 
107

Operating income
82

 
116

 
113

 
76

Net income
28

 
39

 
46

 
30

Net income per share (1):
 
 
 
 
 
 
 
Basic
$
0.58

 
$
0.78

 
$
0.84

 
$
0.54

Diluted
$
0.56

 
$
0.72

 
$
0.77

 
$
0.52

_______________________________
(1)
The dilutive effect of all potentially dilutive common shares is calculated using the treasury-stock method. Certain potentially dilutive common shares issuable are not included in the computation of diluted net income per share because to do so would be anti-dilutive.