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Unbilled Receivables
12 Months Ended
Dec. 31, 2021
Contractors [Abstract]  
Unbilled Receivables UNBILLED RECEIVABLES
Unbilled receivables represent revenue recognized on long-term contracts (contract costs and estimated profits) less associated advances and progress billings. These amounts will be billed in accordance with the agreed-upon contractual terms. Unbilled receivables consisted of the following:
December 3120212020
Unbilled revenue$39,566 $36,657 
Advances and progress billings(31,068)(28,633)
Net unbilled receivables$8,498 $8,024 
On December 31, 2021 and 2020, net unbilled receivables included $3.3 billion and $3.4 billion, respectively, associated with two large international contracts in our Combat Systems segment. We had experienced payment delays in 2018 and 2019 on a wheeled vehicle contract that was negotiated in 2012 before finalizing a contract amendment in 2020 with the customer that included a revised payment schedule. Under the amended contract, we have received progress payments in 2020 and 2021 that have reduced the program’s unbilled balance to $2 billion. The remaining scheduled progress payments will liquidate the net unbilled receivables balance by the end of 2023. A separate tracked vehicle contract that was signed in 2010 has experienced an unbilled receivable build-up over the past year while we work to resolve concerns that were raised by the customer on certain aspects of the program. As a result, the balance on this program has grown to $1.3 billion. Other than the balance related to the two large international contracts, we expect to bill substantially all of the remaining year-end 2021 net unbilled receivables balance during 2022. The amount not expected to be billed in 2022 results primarily from the agreed-upon contractual billing terms.
G&A costs in unbilled revenue on December 31, 2021 and 2020, were $501 and $427, respectively.