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Quarterly Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information Current and Historical Quarterly Results of the Company
 
Three months ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2018
2017
 
2018
2017
 
2018
2017
 
2018
2017
Revenues
$
4,691

$
4,169

 
$
4,789

$
4,214

 
$
4,842

$
4,192

 
$
4,633

$
4,587

Benefits, losses and expenses
4,172

3,768

 
4,252

4,495

 
4,312

4,011

 
4,466

4,165

Income (loss) from continuing operations, net of tax
428

303

 
434

(152
)
 
427

145

 
196

(558
)
Income (loss) from discontinued operations, net of tax
169

75

 
148

112

 
5

89

 
—

(3,145
)
Net income (loss)
$
597

$
378

 
$
582

$
(40
)
 
$
432

$
234

 
$
196

$
(3,703
)
Less: Preferred stock dividends
—

—

 
—

—

 
—

—

 
6

—

Net income (loss) available to common stockholders
$
597

$
378

 
$
582

$
(40
)
 
$
432

$
234

 
$
190

$
(3,703
)
Basic
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax, available to common stockholders per share
$
1.20

$
0.82

 
$
1.21

$
(0.42
)
 
$
1.19

$
0.40

 
$
0.53

$
(1.56
)
Income (loss) from discontinued operations, net of tax per share
$
0.47

$
0.20

 
$
0.41

$
0.31

 
$
0.01

$
0.25

 
$
—

$
(8.81
)
Net income (loss) per common share available to common stockholders
$
1.67

$
1.02

 
$
1.62

$
(0.11
)
 
$
1.20

$
0.65

 
$
0.53

$
(10.37
)
Diluted
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax, available to common stockholders per share
$
1.18

$
0.80

 
$
1.19

$
(0.42
)
 
$
1.17

$
0.40

 
$
0.52

$
(1.56
)
Income (loss) from discontinued operations, net of tax per share
$
0.46

$
0.20

 
$
0.41

$
0.31

 
$
0.02

$
0.24

 
$
—

$
(8.81
)
Net income (loss) per common share available to common stockholders
$
1.64

$
1.00

 
$
1.60

$
(0.11
)
 
$
1.19

$
0.64

 
$
0.52

$
(10.37
)
Weighted average common shares outstanding, basic
357.5

371.4

 
358.3

366.0

 
358.6

360.2

 
359.1

357.0

Weighted average shares outstanding and dilutive potential common shares [1]
363.9

378.6

 
364.2

366.0

 
364.1

367.0

 
364.0

357.0


[1]
In periods where a loss from continuing operations, net of tax, available to common stockholders or net loss available to common stockholders is recognized, inclusion of incremental dilutive shares would be antidilutive. Due to the antidilutive impact, such shares are excluded from the diluted earnings per share calculation of income (loss) from continuing operations, net of tax, available to common stockholders and net income (loss) available to common stockholders in such periods.