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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, 2023 VND (₫) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 VND (₫) | Dec. 31, 2021 VND (₫)
Movement of valuation allowance |  |  |  |
Balance at beginning of the year | ₫ 7,570,934 | $ 317,226,766 | ₫ 2,840,310 | ₫ 1,721,902
Additions | 4,475,132 | 187,510,769 | 4,730,624 | 1,118,408
Balance at end of the year | ₫ 12,046,066 | $ 504,737,535 | ₫ 7,570,934 | ₫ 2,840,310

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration