Contracts with Customers Contracts with Customers

12 Months Ended

Dec. 31, 2021

Contracts with Customers [Abstract]

Long-term Contracts or Programs Disclosure

Contracts with Customers

Unbilled receivables increased from $7,995 at December 31, 2020 to $8,620 at December 31, 2021, primarily driven by revenue recognized at BDS and BGS in excess of billings.

Advances and progress billings increased from $50,488 at December 31, 2020 to $52,980 at December 31, 2021, primarily driven by advances on orders received at BDS, BCA and BGS, partially offset by revenue recognized and the return of customer advances at BCA.

Revenues recognized for the years ended December 31, 2021 and 2020 from amounts recorded as Advances and progress billings at the beginning of each year were $11,336 and $10,360.

The following table summarizes our contract assets under long-term contracts that were unbillable or related to outstanding claims as of December 31:

	Unbilled		Claims
	2021	2020	2021	2020
Current	$5,870	$5,628	$4
Expected to be collected after one year	2,841	2,496	11	$18
Less valuation allowance	(91)	(129)
Total	$8,620	$7,995	$15	$18

Unbilled receivables related to commercial customer incentives expected to be collected after one year were $131 and $178 at December 31, 2021 and 2020. Unbilled receivables related to claims are items that we believe are earned, but are subject to uncertainty concerning their determination or ultimate realization.