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Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data [Abstract]  
Summary of Quarterly Financial Results
The following tables summarize supplementary quarterly financial information:
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2017
 
 
 
 
 
 
 
Total revenue
$
2,748

 
$
2,990

 
$
3,161

 
$
3,252

Income from continuing operations
$
179

 
$
270

 
$
186

 
$
450

Income (loss) from discontinued operations, net of tax
$
23

 
$
(208
)
 
$
16

 
$
(255
)
Net income
$
202

 
$
62

 
$
202

 
$
195

 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
Total revenue
$
1,931

 
$
2,138

 
$
2,360

 
$
2,554

Income from continuing operations
$
138

 
$
143

 
$
134

 
$
242

Income from discontinued operations, net of tax
$
26

 
$
46

 
$
13

 
$
12

Net income
$
164

 
$
189

 
$
147

 
$
254