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Contracts with Customers
 12 Months Ended
Dec. 31, 2023
Contracts with Customers [Abstract]  
Contracts with Customers Contracts with Customers
Unbilled receivables decreased from $8,634 at December 31, 2022 to $8,317 at December 31, 2023, primarily driven by an increase in billings at BDS and BGS.
The following table summarizes our contract assets under long-term contracts that were unbillable or related to outstanding claims as of December 31:
UnbilledClaims
2023202220232022
Current$6,565 $6,478 $6 
Expected to be collected after one year1,771 2,179 40 $16 
Less valuation allowance(19)(23)
Total$8,317 $8,634 $46 $16 
Unbilled receivables related to commercial customer incentives expected to be collected after one year were $42 and $117 at December 31, 2023 and 2022. Unbilled receivables related to claims are items that we believe are earned, but are subject to uncertainty concerning their determination or ultimate realization.
Advances and progress billings increased from $53,081 at December 31, 2022 to $56,328 at December 31, 2023, primarily driven by advances on orders received at BCA, partially offset by revenue recognized at BDS.
Revenues recognized for the years ended December 31, 2023 and 2022 from amounts recorded as Advances and progress billings at the beginning of each year were $15,298 and $12,087.