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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible assets (Details) ₫ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 VND (₫) item $ / ₫ | Dec. 31, 2023 USD ($) item $ / ₫ | Dec. 31, 2022 VND (₫) | Dec. 31, 2021 VND (₫)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Number of reporting units | item | 2 | 2 |  |
Advertising cost | ₫ 1,266,417 | $ 53.1 | ₫ 1,839,069 | ₫ 614,805
Convenience translation rate (USD to VND) | $ / ₫ | 23,866 | 23,866 |  |
License | Minimum |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Estimated useful life | 3 years 2 months | 3 years 2 months |  |
License | Maximum |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Estimated useful life | 3 years 4 months | 3 years 4 months |  |
Software | Minimum |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Estimated useful life | 3 years | 3 years |  |
Software | Maximum |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Estimated useful life | 8 years | 8 years |  |
Others | Minimum |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Estimated useful life | 3 years | 3 years |  |
Others | Maximum |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |
Estimated useful life | 15 years | 15 years |  |

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