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Accounts Receivable, Net of Allowance for Doubtful Accounts (Tables)
3 Months Ended
Mar. 31, 2017
Accounts Receivable, Net of Allowance for Doubtful Accounts [Abstract]  
Components of Accounts Receivable, Net of Allowance for Doubtful Accounts
Accounts receivable, net of allowance for doubtful accounts, consisted of the following:

  
March 31,
 2017
  
December 31,
2016
 
Trade receivables
 
$
413
  
$
408
 
Other
  
17
   
18
 
Subtotal
  
430
   
426
 
Allowance for doubtful accounts
  
(2
)
  
(2
)
Accounts receivable, net of allowance for doubtful accounts
 
$
428
  
$
424