LEASES - Lease income in operating lease (Details) ₫ in Millions	6 Months Ended
Jun. 30, 2025 VND (₫)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 VND (₫)
LEASES
Lease income relating to lease payments	₫ 265,845	$ 10,611,728	₫ 168,261
Lease income relating to variable lease payments not included in the measurement of the lease receivable	₫ 20,524	$ 819,256	₫ 22,923

Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-5

Name:	us-gaap_OperatingLeaseLeaseIncomeLeasePayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration