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CORPORATE INCOME TAX - Valuation allowance for deferred tax assets (Details) ₫ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2024 VND (₫) | Dec. 31, 2023 VND (₫) | Dec. 31, 2022 VND (₫)
Movement of valuation allowance |  |  |  |
Balance at beginning of the year | $ 514,204,849 | ₫ 12,513,175 | ₫ 7,911,734 | ₫ 2,840,310
Net change in valuation allowance | 271,305,897 | 6,602,229 | 4,601,441 | 5,071,424
Balance at end of the year | $ 785,510,746 | ₫ 19,115,404 | ₫ 12,513,175 | ₫ 7,911,734

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ValuationAllowanceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration