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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data
 
Quarter ended
(In millions, except per share data)
March 31
June 30
September 30
December 31
2017
 
 
 
 
Total revenues
$
808

$
801

$
818

$
848

Insurance costs
609

600

613

644

Operating income
49

57

63

48

Net income (1)
29

40

43

66

Basic net income per share (1)
$
0.42

$
0.58

$
0.62

$
0.95

Diluted net income per share (1)
$
0.41

$
0.56

$
0.60

$
0.92

2016
 
 
 
 
Total revenues
$
733

$
746

$
770

$
811

Insurance costs
570

597

609

638

Operating income
26

26

29

43

Net income
11

12

15

23

Basic net income per share
$
0.16

$
0.17

$
0.21

$
0.34

Diluted net income per share
$
0.16

$
0.17

$
0.20

$
0.32


(1) Results of the quarter ended December 31, 2017 included a $40 million benefit due to tax rate change as a result of the TCJA enactment. Refer to Note 12 in these consolidated financial statements for additional discussion.