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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, 2018
T. Rowe Price Corporate Income Fund, Inc.  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T. Rowe Price<br/>Corporate Income Fund<br/><br/>Investor Class<br/><br/>I Class<br/><br/><b>SUMMARY</b>
Objective [Heading] rr_ObjectiveHeading <b>Investment Objective</b>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide high income and some capital growth.
Expense [Heading] rr_ExpenseHeading <b>Fees and Expenses</b>
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. You may also incur brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the table.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <b>Fees and Expenses of the Fund<br/><br/>Shareholder fees (fees paid directly from your investment)</b>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual fund operating expenses<br/>(expenses that you pay each year as a<br/>percentage of the value of your investment)</b>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <b>Portfolio Turnover</b>
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 the fund’s 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 101.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 101.50%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions You may also incur brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the table.
Expense Example [Heading] rr_ExpenseExampleHeading <b>Example</b>
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 <b>Investments, Risks, and Performance<br/><br/>Principal Investment Strategies</b>
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 bonds or junk bonds). The fund may invest in other securities in an effort to enhance income and achieve capital growth. These include convertible securities and preferred stock, together limited to no more than 10% of total assets; mortgage- and asset-backed securities, including mortgage-related 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 bonds and debt securities (including securities of issuers in emerging markets), and there is no limit on the fund’s investments in U.S. dollar-denominated foreign securities. The fund may purchase securities of any maturity and its weighted average maturity will vary with market conditions.

At least 85% of the fund’s net assets must have received an investment-grade rating (i.e., rated in one of the four highest rating categories) by 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 bonds that are rated B (or equivalent) at the time of purchase 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 higher and lower rated securities, the fund may focus its investments in higher-quality issues. When the yield differential is large, the fund may move down the credit scale in search of higher yields. Likewise, if our outlook for foreign securities is favorable, the fund may purchase bonds issued by foreign companies at times 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 overall credit quality, or to shift assets into and out of higher-yielding or lower-yielding securities or certain sectors.
Risk [Heading] rr_RiskHeading <b>Principal Risks</b>
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 risks The investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. The fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies if the fund’s overall investment selections or strategies fail to produce the intended results.

Fixed income markets risks Economic and other market developments can adversely affect fixed income securities markets. At times, participants in these markets may develop concerns about the ability of certain issuers of debt instruments to make timely principal and interest payments, or they may develop concerns about the ability of financial institutions that make markets in certain debt instruments to facilitate an orderly market. Those concerns could cause increased volatility and reduced liquidity in particular securities or in the overall fixed income markets and the related derivatives markets. A lack of liquidity or other adverse credit market conditions may hamper the fund’s ability to sell the debt instruments in which it invests or to find and purchase suitable debt instruments.

Interest rate risks The prices of, and the income generated by, debt instruments held by the fund may be affected by changes in interest rates. A rise in interest rates typically causes the price of a fixed rate debt instrument to fall and its yield to rise. Conversely, a decline in interest rates typically causes the price of a fixed rate debt instrument to rise and the yield to fall. Generally, funds with longer weighted average maturities and durations carry greater interest rate risk. In recent years, the U.S. and many global markets have experienced historically low interest rates. However, interest rates have begun to rise and may continue doing so, increasing the exposure of bond investors such as the fund to the risks associated with rising interest rates.

Credit risks An issuer of a debt instrument could suffer an adverse change in financial condition that results in a payment default (a failure to make scheduled interest or principal payments), rating downgrade, or inability to meet a financial obligation. The fund’s exposure to credit risk is increased to the extent the fund invests in noninvestment-grade bonds (“junk” bonds). Junk bonds should be considered speculative as they carry greater risk of default and erratic price swings due to adverse changes in the credit quality of the issuer.

Liquidity risks The fund may not be able to sell a holding in a timely manner at a desired price. Reduced liquidity in the bond markets can result from a number of events, such as limited trading activity, reductions in bond inventory, and rapid or unexpected changes in interest rates. Less liquid markets could lead to greater price volatility and limit the fund’s ability to sell a holding at a suitable price.

Prepayment and extension risks The fund is subject to prepayment risks because the principal on any debt instrument with an embedded call option may be prepaid at any time, which could reduce the security’s 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 instruments more volatile.

Foreign investing risks The fund’s investments in foreign holdings may be adversely affected by local, political, social, and economic conditions overseas, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. These risks are heightened for the fund’s investments in emerging markets, which are more susceptible to governmental interference, less efficient trading markets, and the imposition of local taxes or restrictions on gaining access to sales proceeds for foreign investors.

Convertible securities and preferred stock risks Investments in convertible securities and preferred stocks subject the fund to risks associated with both equity and fixed income securities, depending on the price of the underlying security and the conversion price. Stocks generally fluctuate in value more than bonds and tend to move in cycles, with periods of rising and falling prices. The value of a stock may decline due to general weakness in the stock market or because of factors that affect a particular company or industry. A convertible security may be called back by the issuer prior to maturity at a price that is disadvantageous to the fund. In addition, convertible securities are typically issued by smaller-capitalized companies whose stock prices are more volatile than companies that have access to more conventional means of raising capital. Preferred stock holders would be paid after corporate bondholders, but before common stockholders, in the event a company fails.
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 <b>Performance</b>
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 (before and after taxes) 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’s Investor Class. Returns for other share classes vary since they have different expenses.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the fund.<br/><br/>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’s Investor Class. Returns for other share classes vary since they have different expenses.<br/><br/>The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <b>troweprice.com</b>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading <b>Corporate Income Fund<br/>Calendar Year Returns</b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended    Total Return  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 6/30/18 was -3.60%.
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns<br/><br/>Periods ended<br/>December 31, 2017</b>
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 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 an IRA.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for the Investor Class and will differ for other share classes.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund.

In addition, the table shows hypothetical after-tax returns to demonstrate 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 an IRA. After-tax returns are shown only for the Investor Class and will differ for other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com.
T. Rowe Price Corporate Income Fund, Inc. | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee $ 20 [1]
Management fees rr_ManagementFeesOverAssets 0.44%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual fund operating expenses rr_ExpensesOverAssets 0.61%
1 year rr_ExpenseExampleYear01 $ 62
3 years rr_ExpenseExampleYear03 195
5 years rr_ExpenseExampleYear05 340
10 years rr_ExpenseExampleYear10 $ 762
2008 rr_AnnualReturn2008 (9.99%)
2009 rr_AnnualReturn2009 22.09%
2010 rr_AnnualReturn2010 9.61%
2011 rr_AnnualReturn2011 7.68%
2012 rr_AnnualReturn2012 11.15%
2013 rr_AnnualReturn2013 (1.42%)
2014 rr_AnnualReturn2014 8.25%
2015 rr_AnnualReturn2015 (0.66%)
2016 rr_AnnualReturn2016 5.08%
2017 rr_AnnualReturn2017 6.57%
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, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (3.60%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <b>Best Quarter</b>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <b>Worst Quarter</b>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.35%)
1 Year rr_AverageAnnualReturnYear01 6.57%
5 Years rr_AverageAnnualReturnYear05 3.49%
10 Years rr_AverageAnnualReturnYear10 5.52%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Oct. 31, 1995
T. Rowe Price Corporate Income Fund, Inc. | I Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee
Management fees rr_ManagementFeesOverAssets 0.44%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets
Other expenses rr_OtherExpensesOverAssets 0.04%
Total annual fund operating expenses rr_ExpensesOverAssets 0.48%
1 year rr_ExpenseExampleYear01 $ 49
3 years rr_ExpenseExampleYear03 154
5 years rr_ExpenseExampleYear05 269
10 years rr_ExpenseExampleYear10 $ 604
1 Year rr_AverageAnnualReturnYear01 6.70%
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since inception rr_AverageAnnualReturnSinceInception 5.75%
Inception date rr_AverageAnnualReturnInceptionDate Dec. 17, 2015
T. Rowe Price Corporate Income Fund, Inc. | Returns after taxes on distributions | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.91%
5 Years rr_AverageAnnualReturnYear05 1.72%
10 Years rr_AverageAnnualReturnYear10 3.63%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Oct. 31, 1995
T. Rowe Price Corporate Income Fund, Inc. | Returns after taxes on distributions and sale of fund shares | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.85%
5 Years rr_AverageAnnualReturnYear05 1.94%
10 Years rr_AverageAnnualReturnYear10 3.59%
Since inception rr_AverageAnnualReturnSinceInception
Inception date rr_AverageAnnualReturnInceptionDate Oct. 31, 1995
T. Rowe Price Corporate Income Fund, Inc. | Bloomberg Barclays U.S. Corporate Investment Grade Bond Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.42%
5 Years rr_AverageAnnualReturnYear05 3.48%
10 Years rr_AverageAnnualReturnYear10 5.65%
Since inception rr_AverageAnnualReturnSinceInception 6.04% [2]
Inception date rr_AverageAnnualReturnInceptionDate Dec. 17, 2015
T. Rowe Price Corporate Income Fund, Inc. | Lipper Corporate Debt Funds BBB-Rated Average  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.88%
5 Years rr_AverageAnnualReturnYear05 3.12%
10 Years rr_AverageAnnualReturnYear10 5.14%
Since inception rr_AverageAnnualReturnSinceInception 5.95% [3]
Inception date rr_AverageAnnualReturnInceptionDate Dec. 31, 2015
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] Return since 12/17/15.
[3] Return since 12/31/15.