Inventories

Inventories consisted of the following:



	March 31 2018		December 31 2017
Long-term contracts in progress		$1,926		$1,854
Commercial aircraft programs	53,008		52,861
Commercial spare parts, used aircraft, general stock materials and other	6,369		6,673
Total		$61,303		$61,388

Long-Term Contracts in Progress

Long-term contracts in progress includes Delta launch program inventory that is being sold at cost to United Launch Alliance (ULA) under an inventory supply agreement that terminates on March 31, 2021. The inventory balance was $267 and $284 at March 31, 2018 and December 31, 2017. See indemnifications to ULA in Note 11.

Included in inventories are capitalized precontract costs of $691 at March 31, 2018 primarily related to the KC-46A Tanker and F/A-18, and $933 at December 31, 2017 primarily related to the KC-46A Tanker, C-17 and F/A-18. See Note 10.

Commercial Aircraft Programs

At March 31, 2018 and December 31, 2017, commercial aircraft programs inventory included the following amounts related to the 787 program: $30,049 and $30,695 of work in process (including deferred production costs of $24,690 and $25,358), $2,839 and $3,189 of supplier advances, and $3,042 and $3,173 of unamortized tooling and other non-recurring costs. At March 31, 2018, $22,034 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 $5,698 is expected to be recovered from units included in the program accounting quantity that represent expected future orders.

At March 31, 2018 and December 31, 2017, commercial aircraft programs inventory included $138 and $151 of unamortized tooling costs related to the 747 program. At March 31, 2018, $133 of unamortized tooling costs are expected to be recovered from units included in the program accounting quantity that have firm orders or commitments. At March 31, 2018, the program accounting quantity includes one already completed aircraft which is being remarketed.

Commercial aircraft programs inventory included amounts credited in cash or other consideration (early issue sales consideration) to airline customers totaling $2,958 and $2,976 at March 31, 2018 and December 31, 2017.