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Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Activity related to self-insured property and casualty reserves The following table summarizes the 2018 and 2017 activity related to our net self-insured property and casualty reserves as of December 31, 2018.

 
 
Beginning Balance
 
Expense
 
Payments
 
Ending Balance
2018 Activity
 
$
84

 
11

 
(29
)
 
$
66

2017 Activity
 
$
98

 
27

 
(41
)
 
$
84