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ACCOUNTS RECEIVABLE
9 Months Ended
Sep. 30, 2017
Accounts Receivable, Net Current [Abstract]  
Accounts Receivables

Note 5. Accounts Receivable

September 30, December 31,
20172016
Trade$8,790$8,449
Less - Allowance for doubtful accounts(203)(272)
$8,587$8,177

Trade receivables include $1,898 million and $1,626 million of unbilled balances under long-term contracts as of September 30, 2017 and December 31, 2016. These amounts are billed in accordance with the terms of the customer contracts to which they relate.