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ACCOUNTS RECEIVABLES
12 Months Ended
Dec. 31, 2018
Accounts Receivable, Net Current [Abstract]  
Accounts, Notes and Other Receivables

Note 8. Accounts Receivable

December 31,
20182017
Trade$7,705$9,068
Less - Allowance for doubtful accounts(197)(202)
7,5088,866

Trade Receivables includes $1,543 million and $1,853 million of unbilled balances under long-term contracts as of December 31, 2018 and December 31, 2017. These amounts are billed in accordance with the terms of customer contracts to which they relate.