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Receivables (Tables)
3 Months Ended
Mar. 31, 2021
Receivables [Abstract]  
Schedule of Receivables
March 31, 2021December 31, 2020
Accounts receivable$1,316 $1,297 
Less: allowance for credit losses(62)(59)
Net trade receivables1,254 1,238 
Unbilled receivables338 294 
Miscellaneous receivables276 251 
Receivables, net$1,868 $1,783