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Comprehensive Income
12 Months Ended
Dec. 31, 2019
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.

Year-Ended December 31,

2019

2018

2017

(in millions, except share or per share amounts)

Comprehensive income available for common stockholders

$

165

$

156

$

87

Earnings per share on comprehensive income

Basic

$

2.18

$

2.12

$

1.24

Diluted

$

2.16

$

2.09

$

1.22

Weighted average common shares outstanding

Basic

76,121,570

73,438,209

69,926,933

Diluted

76,825,863

74,266,370

70,904,921