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Other (Tables)
 12 Months Ended
Dec. 31, 2019
Other [Abstract]  
Other Cost and Expense, Operating

The table below discloses the categories included in other operating expense for the years ended December 31, 2019, 2018, and 2017.

 
2019

 
2018

 
2017

Professional and contract services
$
38

 
$
37

 
$
39

Travel
2

 
2

 
2

Occupancy
15

 
10

 
7

Equipment
8

 
12

 
16

Other
10

 
6

 
6

Total
$
73

 
$
67

 
$
70