We left about $7 billion of equipment in Afghanistan[0], and only gave them about $18 billion of equipment in total since 2001 (including that $7 billion). This was part of a detailed Pentagon report commissioned by the House of Representatives, specifically the Subcommittee on National Security (part of the Committee on Oversight and Reform).
The US did, however, take control of nearly all of Afghanistan's foreign currency reserves (between $4.2-9.5 billion, I don't have the energy to parse all of this)[1]. That left them with at most only about $400 million which was stored in cash in the Presidential Palace, assuming Ashraf Ghani didn't take all of it with him to the UAE.
Warning: Source [1] is much more biased than source [0]. There's a lot of misleading verbiage and mealy-mouthed doublespeak.
The US did, however, take control of nearly all of Afghanistan's foreign currency reserves (between $4.2-9.5 billion, I don't have the energy to parse all of this)[1]. That left them with at most only about $400 million which was stored in cash in the Presidential Palace, assuming Ashraf Ghani didn't take all of it with him to the UAE.
Warning: Source [1] is much more biased than source [0]. There's a lot of misleading verbiage and mealy-mouthed doublespeak.
0: https://www.sigar.mil/pdf/evaluations/SIGAR-23-04-IP.pdf
1: https://crsreports.congress.gov/product/pdf/R/R46879