Contracts with Customers Contracts with Customers	3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Long-term Contracts or Programs Disclosure	Contracts with Customers Unbilled receivables increased from $7,995 at December 31, 2020 to $8,785 at March 31, 2021, primarily driven by revenue recognized at Defense, Space & Security (BDS) and Global Services (BGS) in excess of billings. Advances and progress billings increased from $50,488 at December 31, 2020 to $50,908 at March 31, 2021, primarily driven by advances on orders received at Commercial Airplanes (BCA), BDS, and BGS, partially offset by revenue recognized and the return of customer advances at BCA. Revenues recognized during the three months ended March 31, 2021 and 2020 from amounts recorded as Advances and progress billings at the beginning of each year were $4,718 and $3,790.

Contracts with Customers Contracts with Customers

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Long-term Contracts or Programs Disclosure

Contracts with Customers

Unbilled receivables increased from $7,995 at December 31, 2020 to $8,785 at March 31, 2021, primarily driven by revenue recognized at Defense, Space & Security (BDS) and Global Services (BGS) in excess of billings.

Advances and progress billings increased from $50,488 at December 31, 2020 to $50,908 at March 31, 2021, primarily driven by advances on orders received at Commercial Airplanes (BCA), BDS, and BGS, partially offset by revenue recognized and the return of customer advances at BCA.

Revenues recognized during the three months ended March 31, 2021 and 2020 from amounts recorded as Advances and progress billings at the beginning of each year were $4,718 and $3,790.