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Receivables (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Schedule of Receivables
20202019
Accounts receivable$1,297 $1,162 
Less: allowance for credit losses(59)(62)
Net trade receivables1,238 1,100 
Unbilled receivables294 226 
Miscellaneous receivables251 202 
$1,783 $1,528