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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Schedule of Accounts Receivable Accounts receivable consisted of the following:
December 3120202019
Non-U.S. government$1,701 $1,847 
U.S. government1,040 1,076 
Commercial420 621 
Total accounts receivable$3,161 $3,544