Investor A, C and Institutional [Member] Performance Management - Investor A, C and Institutional - BLACKROCK MANAGED INCOME FUND |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance Information |
| Performance Narrative [Text Block] | The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund’s performance to that of the Bloomberg U.S. Aggregate Bond Index. The table below also compares the Fund’s performance to that of a customized benchmark comprised of the returns of the MSCI World High Dividend Yield Index (17.5%) (Net), the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (22.5%) and the Bloomberg U.S. Aggregate Bond Index (60%) and a customized benchmark comprised of the returns of the Bloomberg U.S. Aggregate Bond Index (70%) and the S&P 500® Index (30%). The customized reference benchmarks are applicable to the Fund because BlackRock believes they have certain characteristics that are helpful in evaluating the Fund. The Fund’s returns prior to October 1, 2016 as reflected in the bar chart and the table are the returns of the Fund when it followed a different investment objective and different investment strategies under the name “BlackRock Investment Grade Bond Portfolio.” The returns for Investor C Shares prior to October 3, 2016, the commencement of operations of Investor C Shares, are based upon the performance of the Fund’s Class K Shares, as adjusted to reflect the fees and expenses applicable to Investor C Shares. To the extent that dividends and distributions have been paid by the Fund, the performance information for the Fund in the chart and table assumes reinvestment of the dividends and distributions. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund’s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund’s returns would have been lower. Updated information on the Fund’s performance, including its current net asset value, can be obtained by visiting www.blackrock.com or can be obtained by phone at (800) 882-0052.
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| Performance Past Does Not Indicate Future [Text] | As with all such investments, past performance (before and after taxes) is not an indication of future results. |
| Performance Information Illustrates Variability of Returns [Text] | The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund. |
| Performance Additional Market Index [Text] | The table compares the Fund’s performance to that of the Bloomberg U.S. Aggregate Bond Index. The table below also compares the Fund’s performance to that of a customized benchmark comprised of the returns of the MSCI World High Dividend Yield Index (17.5%) (Net), the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (22.5%) and the Bloomberg U.S. Aggregate Bond Index (60%) and a customized benchmark comprised of the returns of the Bloomberg U.S. Aggregate Bond Index (70%) and the S&P 500® Index (30%). The customized reference benchmarks are applicable to the Fund because BlackRock believes they have certain characteristics that are helpful in evaluating the Fund. |
| Bar Chart Does Not Reflect Sales Loads [Text] | Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. |
| Bar Chart [Heading] | Investor A Shares ANNUAL TOTAL RETURNS BlackRock Managed Income Fund As of 12/31 |
| Bar Chart Closing [Text Block] | During the ten-year period shown in the bar chart, the highest return for a quarter was 7.39% (quarter ended December 31, 2023) and the lowest return for a quarter was -7.68% (quarter ended March 31, 2020).
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| Performance Table Heading | For the periods ended 12/31/25Average Annual Total Returns |
| Performance Table Narrative | 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 the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor C Shares and Institutional Shares will vary.
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| Performance Table Does Reflect Sales Loads | However, the table includes all applicable fees and sales charges. |
| Performance Table Uses Highest Federal Rate | 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 | Actual after-tax returns depend on the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. |
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor C Shares and Institutional Shares will vary. |
| Performance Availability Website Address [Text] | www.blackrock.com |
| Performance Availability Phone [Text] | (800) 882-0052 |
| INVESTOR A SHARES | |
| Prospectus [Line Items] | |
| Highest Quarterly Return, Label [Optional Text] | highest return |
| Highest Quarterly Return | 7.39% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | lowest return |
| Lowest Quarterly Return | (7.68%) |
| Lowest Quarterly Return, Date | Mar. 31, 2020 |