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ACCOUNTS RECEIVABLE - NET
6 Months Ended
Jun. 30, 2018
Accounts Receivable, Net Current [Abstract]  
Accounts Receivable - Net

Note 7. Accounts Receivable - Net

June 30, December 31,
20182017
Trade$8,801$9,068
Less - Allowance for doubtful accounts(201)(202)
$8,600$8,866

Trade receivables include $1,645 million and $1,853 million of unbilled balances under long-term contracts as of June 30, 2018 and December 31, 2017. These amounts are billed in accordance with the terms of the customer contracts to which they relate.