Inventories

12 Months Ended

Dec. 31, 2023

Inventories at December 31 consisted of the following:


	2023	2022
Commercial aircraft programs	$68,683	$67,702
Long-term contracts in progress	686	582
Capitalized precontract costs(1)	946	794
Commercial spare parts, used aircraft, general stock materials and other	9,426	9,073
Total	$79,741	$78,151

(1) Capitalized precontract costs at December 31, 2023 and 2022 includes amounts related to KC-46A Tanker, Commercial Crew, and T-7A Red Hawk Production Options. See Note 13.

Commercial Aircraft Programs

At December 31, 2023 and 2022, commercial aircraft programs inventory included the following amounts related to the 737 program: deferred production costs of $6,011 and $2,955 and unamortized tooling and other non-recurring costs of $792 and $626. At December 31, 2023, $6,767 of 737 deferred production costs, unamortized tooling and other non-recurring costs are expected to be recovered from units included in the program accounting quantity that have firm orders, and $36 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At December 31, 2023 and 2022, commercial aircraft programs inventory included the following amounts related to the 777X program: $4,638 and $4,059 of work in process, $1,792 and $1,330 of deferred production costs, and $4,063 and $3,774 of unamortized tooling and other non-recurring costs. In April 2022, we decided to pause production of the 777X-9 during 2022 and 2023, which resulted in abnormal production costs of $513 and $325 during the years ended December 31, 2023 and 2022. In the fourth quarter of 2023, the 777X program resumed production.

At December 31, 2023 and 2022, commercial aircraft programs inventory included the following amounts related to the 787 program: deferred production costs of $12,384 and $12,689, $1,764 and $1,831 of supplier advances, and $1,480 and $1,722 of unamortized tooling and other non-recurring costs. At December 31, 2023, $12,384 of 787 deferred production costs, unamortized tooling and other non-recurring costs are expected to be recovered from units included in the program accounting quantity that have firm orders, and $1,480 is expected to be recovered from units included in the program accounting quantity that represent expected future orders. We produced at abnormally low production rates resulting in abnormal production costs that were expensed as incurred from the third quarter of 2021 through the third quarter of 2023. We expensed abnormal production costs of $1,014, $1,240, and $468 during the years ended December 31, 2023, 2022 and 2021. The remaining abnormal costs associated with rework are not expected to be significant.

Commercial aircraft programs inventory included amounts credited in cash or other consideration (early issue sales consideration) to airline customers totaling $4,126 and $3,586 at December 31, 2023 and 2022.