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Comprehensive Income
6 Months Ended
Jun. 30, 2020
Comprehensive Income Detail [Abstract]  
Comprehensive Income 5.  Comprehensive Income

The table below presents comprehensive income and earnings per share on comprehensive income for the periods indicated.

Three Months Ended June 30,

Six Months Ended June 30,

2020

2019

2020

2019

(in millions, except share or per share amounts)

Comprehensive income available for common stockholders

$

36

$

36

$

75

$

84

Earnings per share on comprehensive income

Basic

$

0.46

$

0.47

$

0.97

$

1.11

Diluted

$

0.46

$

0.46

$

0.96

$

1.10

Weighted average common shares outstanding

Basic

77,357,609

75,868,349

77,054,388

75,486,825

Diluted

78,031,462

76,594,934

77,799,963

76,288,342