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ACCOUNTS RECEIVABLES
12 Months Ended
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]  
Accounts, Notes and Other Receivables
 December 31,
20202019
Trade$7,029 $7,639 
Less—Allowance for doubtful accounts(202)(146)
$6,827 $7,493 
Trade Receivables includes $1,589 million and $1,586 million of unbilled balances under long-term contracts as of December 31, 2020 and 2019. These amounts are billed in accordance with the terms of customer contracts to which they relate.