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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price U.S. Treasury Funds, Inc.
Prospectus Date rr_ProspectusDate Oct. 01, 2016
U.S. Treasury Money Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T. Rowe Price

U.S. Treasury Money Fund

SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks maximum preservation of capital and liquidity and, consistent with these goals, the highest possible current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that your investment has a 5% return each year, and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks, and Performance

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund is a money market fund managed in compliance with Rule 2a-7 under the Investment Company Act of 1940. The fund is managed to provide a stable share price of $1.00. The fund invests at least 80% of its net assets in U.S. Treasury securities, which are backed by the full faith and credit of the U.S. government, and repurchase agreements thereon. The remainder is invested in other securities backed by the full faith and credit of the U.S. government and repurchase agreements thereon.

The fund intends to qualify as a “government money market fund” in accordance with amendments to Rule 2a-7 under the 1940 Act that go into effect on October 14, 2016. Government money market funds are required to invest at least 99.5% of their total assets in cash, U.S. government securities, and/or repurchase agreements that are fully collateralized by government securities or cash. Government securities include any security issued or guaranteed as to principal or interest by the U.S. and its agencies or instrumentalities. A repurchase agreement is a contract under which the fund (buyer) purchases a security, usually a U.S. government or agency security, from a bank or well-established securities dealer (seller) that requires the seller to repurchase the securities from the fund at a specific price on a designated date (which is often the next business day).

The fund’s weighted average maturity will not exceed 60 calendar days, the fund’s weighted average life will not exceed 120 calendar days, and the fund will not purchase any security with a remaining maturity longer than 397 calendar days (unless otherwise permitted by Rule 2a-7). When calculating its weighted average maturity, the fund may shorten its maturity by using the interest rate resets of certain adjustable rate securities. The fund may not take into account these resets when calculating its weighted average life.

The securities purchased by the fund are subject to the maturity, quality, diversification, and other requirements of Rule 2a-7 under the Investment Company Act of 1940. All securities purchased by the fund present minimal credit risk in the opinion of T. Rowe Price. In selecting securities for the fund, the portfolio manager may examine relationships among yields of various types and maturities of money market securities in the context of interest rate outlooks. The fund’s yield will fluctuate with changes in short-term interest rates.

U.S. Treasury securities in which the fund may invest include Treasury bills and notes, and repurchase agreements thereon. Other government securities in which the fund may invest include non-U.S. Treasury securities that are backed by the full faith and credit of the U.S. government (such as securities issued by Government National Mortgage Association and other government agencies and securities issued by certain nongovernmental entities but guaranteed by the U.S. government).

The amendments to Rule 2a-7 do not require government money market funds to impose liquidity fees or temporary redemption gates. The fund has no intention to voluntarily impose liquidity fees and/or redemption gates, although the fund’s Board of Directors reserves the right to impose liquidity fees and redemption gates in the future.

The fund may sell holdings for a variety of reasons, such as to adjust the portfolio’s average maturity or to shift assets into and out of higher-yielding securities.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any mutual fund, there can be no guarantee the fund will achieve its objective. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. T. Rowe Price Associates, Inc. has no legal obligation to provide financial support to the fund, and you should not expect that T. Rowe Price Associates, Inc. will provide financial support to the fund at any time.

Money funds have experienced significant pressures from shareholder redemptions, issuer credit downgrades, illiquid markets, and historically low yields on the securities they can hold. There have been a very small number of money funds in other fund complexes that have “broken the buck,” which means that those funds’ investors did not receive $1.00 per share for their investment in those funds. The potential for realizing a loss of principal in the fund could derive from:

Credit risk This is the risk that an issuer of a debt security could suffer an adverse change in financial condition that results in a payment default, security downgrade, or inability to meet a financial obligation. However, the credit quality of the securities held by the fund may change rapidly in certain market environments, which could result in significant net asset value deterioration and the inability to maintain a $1.00 share price.

Interest rate risk This is the risk that a decline in interest rates will lower the fund’s yield, or that a rise in the overall level of interest rates will cause a decline in the prices of fixed income securities held by the fund. The fund’s yield will vary; it is not fixed for a specific period like the yield on a bank certificate of deposit. This is a disadvantage when interest rates are falling because the fund would have to reinvest at lower interest rates. During periods of extremely low or negative short-term interest rates, the fund may not be able to maintain a positive yield or yields on par with historical levels. A sharp and unexpected rise in interest rates could increase the likelihood that the fund’s share price will drop below a dollar. In addition, the fund’s investment adviser may discontinue its voluntary waiver of the fund’s management fee at any time, which could also negatively affect the fund’s yield.

Liquidity risk This is the risk that the fund may not be able to sell a holding in a timely manner at its current carrying value. The fund may experience heavy redemptions, particularly during periods of declining or illiquid markets, which could cause the fund to liquidate its assets at inopportune times or at a depressed value and affect the fund’s ability to maintain a $1.00 share price.

Stable net asset value risk The fund may not be able to maintain a stable $1.00 share price at all times. If a money market fund fails to maintain a stable net asset value, or if there is a perceived threat that a money market fund is likely to fail to maintain a stable net asset value, money market funds in general, including the fund, could experience significant redemption activity. This could reduce the market prices of securities held by the fund and make it more difficult for the fund to maintain a stable $1.00 share price. The fund’s shareholders should not rely on or expect the fund’s investment adviser or an affiliate to purchase distressed assets from the fund, enter into capital support agreements with the fund, make capital infusions into the fund, or take other actions to help the fund maintain a stable $1.00 share price.

Repurchase agreement risk This is the risk that a counterparty to a repurchase agreement becomes insolvent or fails to repurchase securities from the fund as required, which could increase the fund’s costs or prevent the fund from immediately accessing its collateral.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Money Market Fund [Text] rr_RiskMoneyMarketFund Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the fund. The fund’s performance information represents only past performance and is not necessarily an indication of future results.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the fund.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s performance information represents only past performance and is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading U.S. Treasury Money Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
   Quarter
  Ended		   Total
 Return
Best Quarter 12/31/06  1.15%
Worst Quarter   6/30/15   0.00%

The fund’s return for the six months ended 6/30/16 was 0.01%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns

Periods ended
December 31, 2015
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com.
U.S. Treasury Money Fund | U.S. Treasury Money Fund  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee $ 20 [1]
Management fees rr_ManagementFeesOverAssets 0.29%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.44% [2]
1 year rr_ExpenseExampleYear01 $ 45
3 years rr_ExpenseExampleYear03 141
5 years rr_ExpenseExampleYear05 246
10 years rr_ExpenseExampleYear10 $ 555
2006 rr_AnnualReturn2006 4.26%
2007 rr_AnnualReturn2007 4.20%
2008 rr_AnnualReturn2008 1.53%
2009 rr_AnnualReturn2009 0.05%
2010 rr_AnnualReturn2010 0.01%
2011 rr_AnnualReturn2011 0.01%
2012 rr_AnnualReturn2012 0.01%
2013 rr_AnnualReturn2013 0.01%
2014 rr_AnnualReturn2014 0.01%
2015 rr_AnnualReturn2015 0.01%
Year to Date Return, Label rr_YearToDateReturnLabel The fund’s return for the six months ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2016
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.01%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2006
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.15%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 0.01%
5 Years rr_AverageAnnualReturnYear05 0.01%
10 Years rr_AverageAnnualReturnYear10 1.00%
Inception date rr_AverageAnnualReturnInceptionDate Jun. 28, 1982
U.S. Treasury Money Fund | Citigroup 3-Month Treasury Bill (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.03%
5 Years rr_AverageAnnualReturnYear05 0.05%
10 Years rr_AverageAnnualReturnYear10 1.17%
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] The figure shown in the fee table does not match the “Ratio of expenses to average net assets” shown in the Financial Highlights table, as that figure includes the effect of voluntary management fee waivers.