XML 28 R12.htm IDEA: XBRL DOCUMENT v3.8.0.1
ACCOUNTS RECEIVABLE - NET
3 Months Ended
Mar. 31, 2018
Accounts Receivable, Net Current [Abstract]  
Accounts Receivable - Net

Note 7. Accounts Receivable - Net

March 31, December 31,
20182017
Trade$8,975$9,068
Less - Allowance for doubtful accounts(197)(202)
$8,778$8,866

Trade receivables include $1,667 million and $1,853 million of unbilled balances under long-term contracts as of March 31, 2018 and December 31, 2017. These amounts are billed in accordance with the terms of the customer contracts to which they relate.