| Shareholder Report | 6 Months Ended |
| May 31, 2024 USD ($) Holding |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Vanguard Ohio Tax-Free Funds |
| Entity Central Index Key | 0000862341 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| C000007973 | |
| Shareholder Report [Line Items] | |
| Fund Name | Ohio Long-Term Tax-Exempt Fund |
| Class Name | Investor Shares |
| Trading Symbol | VOHIX |
| Annual or Semi-Annual Statement [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | This semi-annual shareholder report contains important information about Vanguard Ohio Long-Term Tax-Exempt Fund (the "Fund") for the period of December 1, 2023, to May 31, 2024. |
| Additional Information Phone Number | 1-800-662-2739 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature</span> |
| Expenses [Text Block] | What were the Fund costs for the period? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $7 0.13% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.13% |
| AssetsNet | $ 1,252,000,000 |
| Holdings Count | Holding | 848 |
| InvestmentCompanyPortfolioTurnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of May 31, 2024) Fund Net Assets (in millions) $1,252 Number of Portfolio Holdings 848 Portfolio Turnover Rate 21% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of May 31, 2024) Less than 1 Year 6.7% 1 to 3 Years 3.8% 3 to 5 Years 3.3% 5 to 10 Years 12.2% 10 to 20 Years 33.4% 20 to 30 Years 32.1% Greater than 30 Years 9.5% Other Assets and Liabilities Net (1.0%) |
| Material Fund Change [Text Block] | |
