T. Rowe Price Tax-Exempt Money Fund, Inc. Municipal securities [Member] Stable net asset value [Member] Market conditions [Member] Redemptions [Member] Liquidity [Member] Credit quality [Member] Interest rates [Member] Alternative minimum tax [Member] Cybersecurity breaches [Member] T. Rowe Price Tax-Exempt Money Fund, Inc. - Investor Class T. Rowe Price Tax-Exempt Money Fund, Inc. - I Class Lipper Tax-Exempt Money Market Funds Average T. Rowe Price Tax-Exempt Money Fund, Inc. T. Rowe Price Tax-Exempt Money Fund, Inc. - Investor Class. T. Rowe Price Tax-Exempt Money Fund, Inc. - I Class. Lipper Tax-Exempt Money Market Funds Average. Municipal securities. Stable net asset value. Market conditions. Redemptions. Liquidity. Credit quality. Interest rates. Alternative minimum tax. Cybersecurity breaches.