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Accounts Receivable
 12 Months Ended
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
Accounts Receivable ACCOUNTS RECEIVABLE
Accounts receivable represent amounts billed and currently due from customers. Payment is typically received from our customers either at periodic intervals (e.g., biweekly or monthly) or upon achievement of contractual milestones. 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 
Receivables from non-U.S. government customers included amounts related to long-term production programs for the Spanish Ministry of Defence of $1.6 billion and $1.7 billion on December 31, 2020 and 2019, respectively. A different ministry, the Spanish Ministry of Industry, has funded work on these programs in advance of costs incurred by the company. The cash advances are reported on the Consolidated Balance Sheet in current customer advances and deposits and will be repaid to the Ministry of Industry as we collect on the outstanding receivables from the Ministry of Defence. The net amounts for these programs on December 31, 2020 and 2019, were advance payments of $245 and $295, respectively. With respect to our other receivables, we expect to collect substantially all of the year-end 2020 balance during 2021.