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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data
 
Quarter ended
(in millions, except per share data)
March 31
June 30
September 30
December 31
2018
 
 
 
 
Total revenues
$
861

$
850

$
875

$
917

Insurance costs
641

630

647

692

Operating income
71

76

62

42

Net income
54

58

51

29

Basic net income per share
$
0.77

$
0.82

$
0.73

$
0.41

Diluted net income per share
$
0.75

$
0.80

$
0.71

$
0.40

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


(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 on December 22, 2017.