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Financial Instruments and Risk Concentration (Tables)
 12 Months Ended
Dec. 31, 2017
Risks And Uncertainties [Abstract]  
Details on Accounts Receivable Allowances

Details of these accounts receivable allowances are as follows:

 

 

2017

 

 

2016

 

 

2015

 

Balance, January 1

$

 

17

 

 

$

 

7

 

 

$

 

12

 

Amounts charged (credited) to operating results

 

 

(9

)

 

 

 

10

 

 

 

 

(5

)

Recoveries and write-offs, net

 

 

—

 

 

 

 

—

 

 

 

 

—

 

Balance, December 31

$

 

8

 

 

$

 

17

 

 

$

 

7