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Comprehensive Income
9 Months Ended
Sep. 30, 2019
Comprehensive Income Detail [Abstract]  
Comprehensive Income 5.   Comprehensive Income

The following table presents comprehensive income and earnings per share on comprehensive income:

Three Months Ended September 30,

Nine Months Ended September 30,

2019

2018

2019

2018

(in millions, except share or per share amounts)

Comprehensive income available for common stockholders

$

30

$

38

$

114

$

113

Earnings per share on comprehensive income

Basic

$

0.39

$

0.51

$

1.50

$

1.55

Diluted

$

0.39

$

0.50

$

1.49

$

1.54

Weighted average common shares outstanding

Basic

76,742,789

74,649,469

75,910,080

72,879,007

Diluted

77,348,976

75,360,089

76,646,487

73,745,640