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ACCOUNTS, NOTES AND OTHER RECEIVABLES
9 Months Ended
Sep. 30, 2014
Accounts, Notes And Other Receivables [Abstract]  
Accounts, Notes and Other Receivables

Note 7. Accounts, Notes and Other Receivables

   September 30,  December 31,
   2014  2013
       
 Trade$8,021 $7,530
 Other 553  646
   8,574  8,176
 Less: Allowance for doubtful accounts (259)  (247)
  $8,315 $7,929

Trade receivables include $ 1,697 million and $1,609 million of unbilled balances under long-term contracts as of September 30, 2014 and December 31, 2013, respectively. These amounts are billed in accordance with the terms of customer contracts to which they relate.