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Accounts Receivable, Net of Allowance for Doubtful Accounts
 3 Months Ended
Mar. 31, 2017
Accounts Receivable, Net of Allowance for Doubtful Accounts [Abstract]  
Accounts Receivable, Net of Allowance for Doubtful Accounts
5.
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
 

Bad debt expense was less than $1 million for each of the three months ended March 31, 2017 and 2016, and was recorded in “Selling, general and administrative expenses” in the unaudited Condensed Consolidated Statements of Operations.