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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price Corporate Income Fund, Inc.
Prospectus Date rr_ProspectusDate Oct. 01, 2012
T. Rowe Price Corporate Income Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T. Rowe Price

Corporate Income Fund

SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide high income and some capital growth.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 72.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.50%
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. The example also assumes 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 will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in corporate debt securities. Holdings will mainly consist of investment-grade bonds, although the fund has the flexibility to purchase some noninvestment-grade bonds (also called high-yield or junk bonds). The fund may invest in other securities in an effort to enhance income and achieve capital growth. These include: convertible securities, preferred stock, and equities, together limited to no more than 10% of total assets; mortgage- and asset-backed securities, including some mortgage derivatives, together limited to no more than 5% of total assets; and U.S. Treasury and agency securities. In addition, up to 10% of the fund’s total assets may be invested in non-U.S. dollar-denominated fixed income securities, and there is no limit on the fund’s investments in U.S. dollar-denominated foreign securities. The fund does not have any maturity restrictions on the securities it purchases, but normally the portfolio’s weighted average maturity is expected to be between four and 15 years.

At least 85% of the fund’s net assets must have received an investment-grade rating (AAA, AA, A, or BBB, or an equivalent rating) from at least one major credit rating agency or, if not rated by any credit rating agency, deemed to be of investment-grade quality by T. Rowe Price. Such investment-grade investments could include “split-rated” securities, which are securities that are rated as investment-grade by at least one credit rating agency but rated below investment grade by another agency. Up to 15% of the fund’s net assets can be invested in noninvestment-grade securities. The fund will not purchase any individual bond that is rated below B (or equivalent) by any major credit rating agency, and the fund’s investments in B rated bonds will not exceed 5% of its net assets.

The fund’s investment program provides some flexibility in seeking high income. Within the limits described, the fund can seek the most advantageous combination of securities. For example, when the difference is small between the yields of various quality levels, or the outlook warrants, the fund may concentrate investments in higher-quality issues. When the difference is large, the fund may move down the credit scale in search of higher yields. Likewise, the fund may purchase bonds issued by foreign companies, including U.S. dollar-denominated Yankee bonds, when they offer higher yields than U.S. bonds of comparable quality and maturity.

The fund may sell holdings for a variety of reasons, such as to adjust the portfolio’s average maturity, duration, or credit quality or to shift assets into and out of higher-yielding or lower-yielding securities or different sectors.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any mutual fund, there is no guarantee that the fund will achieve its objective. The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund are summarized as follows:

Active management risk The fund is subject to the risk that the investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. If the securities selected and strategies employed by the fund fail to produce the intended results, the fund could underperform other funds with similar objectives and investment strategies.

Interest rate risk This is the risk that a rise in interest rates will cause the price of a fixed rate debt security to fall. Generally, securities with longer maturities and funds with longer weighted average maturities carry greater interest rate risk.

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.

Liquidity risk This is the risk that the fund may not be able to sell a holding in a timely manner at a desired price.

Foreign investing risk This is the risk that the fund’s investments in foreign securities may be adversely affected by political and economic conditions overseas, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.

Prepayment risk and extension risk Prepayment risk is the risk that the principal on any debt security with an embedded call option may be prepaid at any time, which could reduce yield and market value. The rate of prepayments tends to increase as interest rates fall, which could cause the average maturity of the portfolio to shorten. Extension risk may result from a rise in interest rates, which tends to make callable debt securities more volatile.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.

The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-225-5132
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading
Corporate Income Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Quarter
Ended		Total
Return
Best Quarter    6/30/09    10.28%
Worst Quarter     9/30/08   -7.35%

The fund’s return for the six months ended 6/30/12 was 5.25%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns

Periods ended
December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com or may be obtained by calling 1-800-225-5132.
T. Rowe Price Corporate Income Fund, Inc. | T. Rowe Price Corporate Income Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Maximum account fee rr_MaximumAccountFee 20 [1]
Management fees rr_ManagementFeesOverAssets 0.45%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 0.65%
1 year rr_ExpenseExampleYear01 66
3 years rr_ExpenseExampleYear03 208
5 years rr_ExpenseExampleYear05 362
10 years rr_ExpenseExampleYear10 810
2002 rr_AnnualReturn2002 4.23%
2003 rr_AnnualReturn2003 13.07%
2004 rr_AnnualReturn2004 7.06%
2005 rr_AnnualReturn2005 2.52%
2006 rr_AnnualReturn2006 4.93%
2007 rr_AnnualReturn2007 3.71%
2008 rr_AnnualReturn2008 (9.99%)
2009 rr_AnnualReturn2009 22.09%
2010 rr_AnnualReturn2010 9.61%
2011 rr_AnnualReturn2011 7.68%
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, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 5.25%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.35%)
1 Year rr_AverageAnnualReturnYear01 7.68%
5 Years rr_AverageAnnualReturnYear05 6.11%
10 Years rr_AverageAnnualReturnYear10 6.21%
T. Rowe Price Corporate Income Fund, Inc. | Returns after taxes on distributions | T. Rowe Price Corporate Income Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.59%
5 Years rr_AverageAnnualReturnYear05 4.10%
10 Years rr_AverageAnnualReturnYear10 4.18%
T. Rowe Price Corporate Income Fund, Inc. | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Corporate Income Fund, Inc.
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.49%
5 Years rr_AverageAnnualReturnYear05 4.08%
10 Years rr_AverageAnnualReturnYear10 4.13%
T. Rowe Price Corporate Income Fund, Inc. | Barclays U.S. Corporate Investment Grade Bond Index (reflects no deduction for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.15%
5 Years rr_AverageAnnualReturnYear05 6.82%
10 Years rr_AverageAnnualReturnYear10 6.36%
T. Rowe Price Corporate Income Fund, Inc. | Lipper Corporate Debt Funds BBB-Rated Average
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.19%
5 Years rr_AverageAnnualReturnYear05 6.27%
10 Years rr_AverageAnnualReturnYear10 6.20%
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.