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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (Unaudited) SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
 
Quarter ended
(in millions, except per share data)
March 31
June 30
September 30
December 31
2019
 
 
 
 
Total revenues
$
934

$
935

$
969

$
1,018

Insurance costs
683

704

748

792

Operating income
82

55

68

63

Net income
63

46

55

48

Basic net income per share
$
0.91

$
0.65

$
0.80

$
0.69

Diluted net income per share
$
0.89

$
0.64

$
0.78

$
0.68

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