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Contracts with Customers
 12 Months Ended
Dec. 31, 2022
Contracts with Customers [Abstract]  
Contracts with Customers Contracts with Customers
Unbilled receivables increased from $8,620 at December 31, 2021 to $8,634 at December 31, 2022, primarily driven by revenue recognized in excess of billings at BGS, partially offset by billings in excess of revenue recognized at BDS.
Advances and progress billings increased from $52,980 at December 31, 2021 to $53,081 at December 31, 2022, primarily driven by advances on orders received at BCA, partially offset by revenue recognized at BDS and BGS.
Revenues recognized for the years ended December 31, 2022 and 2021 from amounts recorded as Advances and progress billings at the beginning of each year were $12,087 and $11,336.
The following table summarizes our contract assets under long-term contracts that were unbillable or related to outstanding claims as of December 31:
UnbilledClaims
2022202120222021
Current$6,478 $5,870 $4 
Expected to be collected after one year2,179 2,841 $16 $11 
Less valuation allowance(23)(91)
Total$8,634 $8,620 $16 $15 
Unbilled receivables related to commercial customer incentives expected to be collected after one year were $117 and $131 at December 31, 2022 and 2021. Unbilled receivables related to claims are items that we believe are earned, but are subject to uncertainty concerning their determination or ultimate realization.