| Form N-CSR Cover | 12 Months Ended |
| Jul. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | The Income Fund of America |
| Entity Central Index Key | 0000050013 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Jul. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | The Income Fund of America |
| Entity Central Index Key | 0000050013 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| The Income Fund of America - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class A |
| Trading Symbol | AMECX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-A |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-A |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.58 % |
| Expenses Paid, Amount | $ 61 |
| Expense Ratio, Percent | 0.58% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class capitalgroup.com/mutual-fund-returns-A The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | How a hypothetical $10,000 investment has grown Figures reflect deduction of the maximum sales charge and assume reinvestment of dividends and capital gains. |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year 5 years 10 years The Income Fund of America — Class A (with sales charge) * 5.57 % 6.35 % 6.16 % The Income Fund of America — Class A (without sales charge) * 12.02 7.62 6.79 S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class C |
| Trading Symbol | IFACX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-C |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-C |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.32 % |
| Expenses Paid, Amount | $ 139 |
| Expense Ratio, Percent | 1.32% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class C shares gained 11.20% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-C What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | How a hypothetical $10,000 investment has grown Figures assume reinvestment of dividends and capital gains. |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year 5 years 10 years The Income Fund of America — Class C (with sales charge) * 10.20 % 6.82 % 6.13 % The Income Fund of America — Class C (without sales charge) * 11.20 6.82 6.13 S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class T | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class T |
| Trading Symbol | TIAFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class T $ 0.32 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.32% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class T shares gained 12.31% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year 5 years Since inception 1 The Income Fund of America — Class T (with sales charge) 2 9.49 % 7.35 % 7.11 % The Income Fund of America — Class T (without sales charge) 2 12.31 7.89 7.48 S&P 500 Index 3 22.15 15.00 14.32 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index 3 16.02 9.90 9.89 Bloomberg U.S. Aggregate Index 3 5.10 0.19 1.32 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. 1 2 3 |
| Performance Inception Date | Apr. 07, 2017 |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class 529-F-1 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class F-1 |
| Trading Symbol | IFAFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-F1 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-F1 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class F-1 $ 0.64 % |
| Expenses Paid, Amount | $ 68 |
| Expense Ratio, Percent | 0.64% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class F-1 shares gained 11.94% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-F1 The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | How a hypothetical $10,000 investment has grown Figures assume reinvestment of dividends and capital gains. |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year 5 years 10 years The Income Fund of America — Class F-1 * 11.94 % 7.55 % 6.71 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † directly |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class F-2 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class F-2 |
| Trading Symbol | AMEFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-F2 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-F2 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class F-2 $ 0.37 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.37% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class F-2 shares gained 12.26% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-F2 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class F-2 * 12.26 % 7.84 % 6.99 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class F-3 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class F-3 |
| Trading Symbol | FIFAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-F3 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-F3 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class F-3 $ 0.27 % |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.27% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class F-3 shares gained 12.38% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-F3 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years Since inception 1 The Income Fund of America — Class F-3 2 12.38 % 7.94 % 7.58 % S&P 500 Index 3 22.15 15.00 14.40 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index 3 16.02 9.90 9.97 Bloomberg U.S. Aggregate Index 3 5.10 0.19 1.41 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. 1 2 3 |
| Performance Inception Date | Jan. 27, 2017 |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class 529-A | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class 529-A |
| Trading Symbol | CIMAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529A |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-529A |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 529-A $ 0.61 % |
| Expenses Paid, Amount | $ 65 |
| Expense Ratio, Percent | 0.61% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-A shares gained 12.01% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-529A What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class 529-A (with sales charge) * 8.10 % 6.81 % 6.35 % The Income Fund of America — Class 529-A (without sales charge) * 12.01 7.58 6.73 S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class 529-C | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class 529-C |
| Trading Symbol | CIMCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529C |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-529C |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 529-C $ 1.36 % |
| Expenses Paid, Amount | $ 144 |
| Expense Ratio, Percent | 1.36% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-C shares gained 11.19% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-529C What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class 529-C (with sales charge) * 10.19 % 6.78 % 6.32 % The Income Fund of America — Class 529-C (without sales charge) * 11.19 6.78 6.32 S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class 529-E | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class 529-E |
| Trading Symbol | CIMEX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529E |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-529E |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 529-E $ 0.84 % |
| Expenses Paid, Amount | $ 89 |
| Expense Ratio, Percent | 0.84% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-E shares gained 11.71% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-529E What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class 529-E * 11.71 % 7.33 % 6.48 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class 529-T | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class 529-T |
| Trading Symbol | TFAAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 529-T $ 0.37 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.37% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-T shares gained 12.25% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years Since inception 1 The Income Fund of America — Class 529-T (with sales charge) 2 9.43 % 7.29 % 7.05 % The Income Fund of America — Class 529-T (without sales charge) 2 12.25 7.84 7.42 S&P 500 Index 3 22.15 15.00 14.32 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index 3 16.02 9.90 9.89 Bloomberg U.S. Aggregate Index 3 5.10 0.19 1.32 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. 1 2 3 Ltd |
| Performance Inception Date | Apr. 07, 2017 |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class 529-F-1 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class 529-F-1 |
| Trading Symbol | CIMFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529F1 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-529F1 |
| Expenses [Text Block] | What were the fund costs for the last year? m Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 529-F-1 $ 0.45 % |
| Expenses Paid, Amount | $ 48 |
| Expense Ratio, Percent | 0.45% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-F-1 shares gained 12.20% for the year ended July 31, 2024. That result compares with a 1 6.02 capitalgroup.com/mutual-fund-returns-529F1 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year 5 years 10 years The Income Fund of America — Class 529-F-1 * 12.20 % 7.78 % 6.95 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/ Bloomberg * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America® Class 529-F-2 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class 529-F-2 |
| Trading Symbol | FAIFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529F2 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-529F2 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 529-F-2 $ 0.36 % |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.36% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-F-2 shares gained 12.30% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-529F2 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year Since inception 1 The Income Fund of America — Class 529-F-2 2 12.30 % 10.22 % S&P 500 Index 3 22.15 16.78 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index 3 16.02 10.10 Bloomberg U.S. Aggregate Index 3 5.10 -1.95 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. 1 2 3 Ltd |
| Performance Inception Date | Oct. 30, 2020 |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America® Class 529-F-3 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class 529-F-3 |
| Trading Symbol | FFIFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529F3 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-529F3 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class 529-F-3 $ 0.32 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.32% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-F-3 shares gained 12.31% for the year ended July 31, 2 Bloomberg capitalgroup.com/mutual-fund-returns-529F3 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year Since inception 1 The Income Fund of America — Class 529-F-3 2 12.31 % 10.24 % S&P 500 Index 3 22.15 16.78 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index 3 16.02 10.10 Bloomberg U.S. Aggregate Index 3 5.10 -1.95 Effective July 24, 2024, the fund's primary benchmark 1 2020 2 3 |
| Performance Inception Date | Oct. 30, 2020 |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Income Fund of America® Class R-1 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-1 |
| Trading Symbol | RIDAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R1 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R1 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-1 $ 1.35 % |
| Expenses Paid, Amount | $ 143 |
| Expense Ratio, Percent | 1.35% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-1 shares gained 11.15% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R1 What During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year 5 years 10 years The Income Fund of America — Class R-1 * 11.15 % 6.78 % 5.94 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed * † Indices Ltd |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Income Fund of America® Class R-2 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-2 |
| Trading Symbol | RIDBX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R2 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R2 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-2 $ 1.35 % |
| Expenses Paid, Amount | $ 143 |
| Expense Ratio, Percent | 1.35% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-2 shares gained 11.16% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R2 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average annual total returns 1 year 5 years 10 years The Income Fund of America — Class R-2 * 11.16 % 6.77 % 5.94 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Income Fund of America® Class R-2E [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-2E |
| Trading Symbol | RIEBX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R2E |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R2E |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-2E $ 1.07 % |
| Expenses Paid, Amount | $ 113 |
| Expense Ratio, Percent | 1.07% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-2E shares gained 11.47% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R2E What factors influenced results During the fund’s fiscal The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years Since inception 1 The Income Fund of America — Class R-2E 2 11.47 % 7.09 % 6.08 % S&P 500 Index 3 22.15 15.00 12.82 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index 3 16.02 9.90 8.98 Bloomberg U.S. Aggregate Index 3 5.10 0.19 1.51 Effective July 24, 2024, the fund's primary benchmark changed from the 65 500 1 2 3 |
| Performance Inception Date | Aug. 29, 2014 |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Income Fund of America® Class R-3 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-3 |
| Trading Symbol | RIDCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R3 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R3 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-3 $ 0.91 % |
| Expenses Paid, Amount | $ 96 |
| Expense Ratio, Percent | 0.91% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-3 shares gained 11.66% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R3 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class R-3 * 11.66 % 7.26 % 6.41 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024 * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Key fund statistics Fund net assets (in millions $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Income Fund of America - Class R-4 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-4 |
| Trading Symbol | RIDEX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R4 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R4 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-4 $ 0.61 % |
| Expenses Paid, Amount | $ 65 |
| Expense Ratio, Percent | 0.61% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-4 shares gained 12.01% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R4 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | How a hypothetical $10,000 investment has grown Figures assume reinvestment of dividends and capital gains. |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class R-4 * 12.01 % 7.57 % 6.73 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Income Fund of America - Class R-5E | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-5E |
| Trading Symbol | RIDHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R5E |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R5E |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-5E $ 0.41 % |
| Expenses Paid, Amount | $ 44 |
| Expense Ratio, Percent | 0.41% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-5E shares gained 12.22% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R5E What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | How a hypothetical $10,000 investment has grown Figures assume reinvestment of dividends and capital gains. |
| Average Annual Return [Table Text Block] | 1 year 5 years Since inception 1 The Income Fund of America — Class R-5E 2 12.22 % 7.79 % 7.69 % S&P 500 Index 3 22.15 15.00 13.86 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index 3 16.02 9.90 9.65 Bloomberg U.S. Aggregate Index 3 5.10 0.19 1.51 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. 1 2 3 |
| Performance Inception Date | Nov. 20, 2015 |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Income Fund of America - Class R-5 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-5 |
| Trading Symbol | RIDFX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R5 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R5 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-5 $ 0.31 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.31% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-5 shares gained 12.32% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R5 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | How a hypothetical $10,000 investment has grown Figures assume reinvestment of dividends and capital gains. |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class R-5 * 12.32 % 7.91 % 7.05 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| The Income Fund of America - Class R-6 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Income Fund of America® |
| Class Name | Class R-6 |
| Trading Symbol | RIDGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Income Fund of America (the "fund") |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R6 |
| Additional Information Phone Number | (800) 421-4225 |
| Additional Information Website | capitalgroup.com/mutual-fund-literature-R6 |
| Expenses [Text Block] | What were the fund costs for the last year? Share class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R-6 $ 0.27 % |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.27% |
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-6 shares gained 12.36% for the year ended July 31, 2024. That result compares with a 16.02% gain for the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/mutual-fund-returns-R6 What factors influenced results During the fund’s fiscal year, the U.S. economy saw robust growth, driven by a rise in business investment, consumer spending and government expenditure. Slight declines in inflation and a modest softening of the labor market led to expectations that the U.S. Federal Reserve might cut interest rates, but this did not occur during the period; bond yields remained higher as a result. The portfolio’s holdings in the financial and industrial sectors saw returns higher than that of the overall portfolio during the period. Conversely, the highest yielding equities saw returns below that of the overall portfolio, though it is worth noting that the dividends paid remain a critical part of the fund’s income objective. Similarly, the fund’s bond holdings helped support the fund's income objective, but also provided a measure of stability when equity markets were volatile. The fund’s position in health care equities saw a negative return for the period. Holdings in consumer staples and telecommunications recorded positive returns but were below the overall portfolio return. |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. |
| Line Graph [Table Text Block] | How a hypothetical $10,000 investment has grown Figures assume reinvestment of dividends and capital gains. |
| Average Annual Return [Table Text Block] | 1 year 5 years 10 years The Income Fund of America — Class R-6 * 12.36 % 7.94 % 7.10 % S&P 500 Index † 22.15 15.00 13.15 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index † 16.02 9.90 9.23 Bloomberg U.S. Aggregate Index † 5.10 0.19 1.61 Effective July 24, 2024, the fund's primary benchmark changed from the 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index (the "Previous Primary Benchmark") to the S&P 500 Index, a broad-based index that represents the overall securities markets, as required by the SEC. The Previous Primary Benchmark provides a means to compare the fund's results to a benchmark that the investment adviser believes is more representative of the fund's investment universe. There is no change in the fund's investment strategies as a result of the benchmark change. * † |
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 125,420,000,000 |
| Holdings Count | Holding | 2,704 |
| Advisory Fees Paid, Amount | $ 270,000,000 |
| Investment Company, Portfolio Turnover | 92% |
| Additional Fund Statistics [Text Block] | Fund net assets (in millions) $ Total number of portfolio holdings 2,704 Total advisory fees paid (in millions) $ Portfolio turnover rate including 92 % Portfolio turnover rate excluding mortgage dollar roll transactions 43 % |
| Holdings [Text Block] | Portfolio holdings by asset type *Includes derivatives. |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | |||||||||||||||||||
| Jul. 31, 2024 | Jan. 31, 2024 | Jul. 31, 2023 | Jan. 31, 2023 | Jul. 31, 2022 | Jan. 31, 2022 | Jul. 31, 2021 | Jan. 31, 2021 | Oct. 30, 2020 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Apr. 07, 2017 | Jan. 27, 2017 | Jul. 31, 2016 | Nov. 20, 2015 | Jul. 31, 2015 | Aug. 29, 2014 | Jul. 31, 2014 | |
| The Income Fund of America - Class R-6 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-6 | |||||||||||||||||||
| Account Value | $ 19,864 | $ 17,679 | $ 16,874 | $ 17,095 | $ 13,945 | $ 13,554 | $ 12,969 | $ 12,085 | $ 11,093 | $ 10,330 | $ 10,000 | |||||||||
| Income Fund of America - Class R-5 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-5 | |||||||||||||||||||
| Account Value | $ 19,773 | 17,604 | 16,811 | 17,040 | 13,904 | 13,516 | 12,938 | 12,068 | 11,083 | 10,325 | 10,000 | |||||||||
| Income Fund of America - Class R-5E | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-5E | |||||||||||||||||||
| Account Value | $ 19,050 | 16,975 | 16,232 | 16,471 | 13,451 | 13,095 | 12,545 | 11,710 | 10,770 | $ 10,000 | ||||||||||
| Income Fund of America - Class R-4 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-4 | |||||||||||||||||||
| Account Value | $ 19,181 | 17,125 | 16,408 | 16,677 | 13,655 | 13,315 | 12,785 | 11,959 | 11,018 | 10,290 | 10,000 | |||||||||
| Income Fund of America® Class R-3 [Member] | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-3 | |||||||||||||||||||
| Account Value | $ 18,621 | 16,677 | 16,024 | 16,337 | 13,416 | 13,118 | 12,638 | 11,856 | 10,954 | 10,265 | 10,000 | |||||||||
| Income Fund of America® Class R-2E [Member] | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-2E | |||||||||||||||||||
| Account Value | $ 17,960 | 16,111 | 15,499 | 15,828 | 13,015 | 12,752 | 12,302 | 11,562 | 10,695 | 10,028 | $ 10,000 | |||||||||
| Income Fund of America® Class R-2 [Member] | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-2 | |||||||||||||||||||
| Account Value | $ 17,814 | 16,024 | 15,465 | 15,842 | 13,065 | 12,838 | 12,420 | 11,706 | 10,863 | 10,224 | 10,000 | |||||||||
| Income Fund of America® Class R-1 [Member] | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-1 | |||||||||||||||||||
| Account Value | $ 17,806 | 16,020 | 15,459 | 15,828 | 13,053 | 12,829 | 12,409 | 11,697 | 10,855 | 10,215 | 10,000 | |||||||||
| The Income Fund of America® Class 529-F-3 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-3 | |||||||||||||||||||
| Account Value | $ 14,417 | $ 13,195 | 12,837 | $ 12,682 | 12,260 | $ 12,923 | 12,428 | $ 11,115 | $ 10,000 | |||||||||||
| The Income Fund of America® Class 529-F-2 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-2 | |||||||||||||||||||
| Account Value | $ 14,403 | 13,180 | 12,825 | 12,671 | 12,251 | 12,920 | 12,424 | 11,117 | 10,000 | |||||||||||
| The Income Fund of America - Class 529-F-1 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-1 | |||||||||||||||||||
| Account Value | $ 19,576 | 17,448 | 16,681 | 16,933 | 13,834 | 13,457 | 12,895 | 12,039 | 11,063 | 10,316 | 10,000 | |||||||||
| The Income Fund of America - Class 529-T | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-T (with sales charge) | |||||||||||||||||||
| Account Value | $ 16,460 | 14,664 | 14,005 | 14,202 | 11,597 | 11,287 | 10,813 | 10,094 | $ 9,750 | |||||||||||
| The Income Fund of America - Class 529-E | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-E | |||||||||||||||||||
| Account Value | $ 18,729 | 16,765 | 16,091 | 16,401 | 13,454 | 13,150 | 12,659 | 11,873 | 10,962 | 10,268 | 10,000 | |||||||||
| The Income Fund of America - Class 529-C | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-C (with sales charge) | |||||||||||||||||||
| Account Value | $ 18,453 | 16,474 | 15,776 | 16,040 | 13,132 | 12,806 | 12,389 | 11,681 | 10,842 | 10,209 | 10,000 | |||||||||
| The Income Fund of America - Class 529-A | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-A (with sales charge) | |||||||||||||||||||
| Account Value | $ 18,502 | 16,518 | 15,819 | 16,083 | 13,167 | 12,840 | 12,329 | 11,537 | 10,626 | 9,930 | 9,648 | |||||||||
| The Income Fund of America - Class F-3 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-3 | |||||||||||||||||||
| Account Value | $ 17,300 | 15,395 | 14,694 | 14,886 | 12,145 | 11,806 | 11,295 | 10,530 | $ 10,000 | |||||||||||
| The Income Fund of America - Class F-2 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-2 | |||||||||||||||||||
| Account Value | $ 19,657 | 17,510 | 16,730 | 16,967 | 13,855 | 13,477 | 12,913 | 12,050 | 11,072 | 10,320 | 10,000 | |||||||||
| The Income Fund of America - Class 529-F-1 | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-1 | |||||||||||||||||||
| Account Value | $ 19,146 | 17,104 | 16,383 | 16,664 | 13,645 | 13,308 | 12,779 | 11,960 | 11,016 | 10,294 | 10,000 | |||||||||
| The Income Fund of America - Class T | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class T (with sales charge) | |||||||||||||||||||
| Account Value | $ 16,525 | 14,714 | 14,044 | 14,237 | 11,620 | 11,303 | 10,822 | 10,096 | 9,750 | |||||||||||
| The Income Fund of America - Class C | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class C (with sales charge) | |||||||||||||||||||
| Account Value | $ 18,124 | 16,180 | 15,491 | 15,864 | 13,078 | 12,844 | 12,421 | 11,705 | 10,859 | 10,218 | 10,000 | |||||||||
| The Income Fund of America - Class A | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class A (with sales charge) | |||||||||||||||||||
| Account Value | $ 18,183 | 16,232 | 15,541 | 15,794 | 12,921 | 12,595 | 12,085 | 11,296 | 10,397 | 9,708 | 9,424 | |||||||||
| Standard & Poor's 500 Index [Member] | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||||||
| Account Value | $ 34,403 | 15,593 | 28,165 | 12,906 | 24,921 | 14,061 | 26,134 | 11,405 | 10,000 | 19,153 | 17,108 | 15,843 | 13,629 | 10,000 | 10,000 | 11,745 | 10,000 | 11,121 | 10,000 | 10,000 |
| 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index [Member] | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index | |||||||||||||||||||
| Account Value | $ 24,176 | 13,022 | 20,838 | 11,421 | 19,430 | 12,405 | 20,658 | 10,920 | 10,000 | 16,873 | 15,079 | 13,904 | 12,629 | 10,000 | 10,000 | 11,478 | 10,000 | 10,831 | 10,000 | 10,000 |
| Bloomberg U.S. Aggregate Index [Member] | ||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | |||||||||||||||||||
| Account Value | $ 11,727 | $ 9,115 | $ 11,158 | $ 8,927 | $ 11,547 | $ 9,742 | $ 12,705 | $ 10,040 | $ 10,000 | $ 12,795 | $ 11,619 | $ 10,750 | $ 10,837 | $ 10,000 | $ 10,000 | $ 10,893 | $ 10,000 | $ 10,282 | $ 10,000 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 45 Months Ended | 60 Months Ended | 88 Months Ended | 90 Months Ended | 104 Months Ended | 119 Months Ended | 120 Months Ended | |||||||||
| Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | [8] | Jul. 31, 2024 | [2] | Jul. 31, 2024 | [3] | Jul. 31, 2024 | |||||||
| The Income Fund of America - Class R-6 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-6 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.36% | 7.94% | 7.10% | |||||||||||||
| Income Fund of America - Class R-5 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-5 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.32% | 7.91% | 7.05% | |||||||||||||
| Income Fund of America - Class R-5E | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-5E | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.22% | 7.79% | 7.69% | |||||||||||||
| Income Fund of America - Class R-4 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-4 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.01% | 7.57% | 6.73% | |||||||||||||
| Income Fund of America® Class R-3 [Member] | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-3 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 11.66% | 7.26% | 6.41% | |||||||||||||
| Income Fund of America® Class R-2E [Member] | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-2E | ||||||||||||||||
| Average Annual Return, Percent | [1] | 11.47% | 7.09% | 6.08% | |||||||||||||
| Income Fund of America® Class R-2 [Member] | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-2 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 11.16% | 6.77% | 5.94% | |||||||||||||
| Income Fund of America® Class R-1 [Member] | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-1 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 11.15% | 6.78% | 5.94% | |||||||||||||
| The Income Fund of America® Class 529-F-3 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-3 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.31% | 10.24% | [4] | |||||||||||||
| The Income Fund of America® Class 529-F-2 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-2 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.30% | 10.22% | [5] | |||||||||||||
| The Income Fund of America - Class 529-F-1 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-1 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.20% | 7.78% | 6.95% | |||||||||||||
| The Income Fund of America - Class 529-T | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-T (with sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 9.43% | 7.29% | 7.05% | [6] | ||||||||||||
| The Income Fund of America - Class 529-E | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-E | ||||||||||||||||
| Average Annual Return, Percent | [7] | 11.71% | 7.33% | 6.48% | |||||||||||||
| The Income Fund of America - Class 529-C | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-C (with sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [7] | 10.19% | 6.78% | 6.32% | |||||||||||||
| The Income Fund of America - Class 529-A | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-A (with sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [7] | 8.10% | 6.81% | 6.35% | |||||||||||||
| The Income Fund of America - Class F-3 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-3 | ||||||||||||||||
| Average Annual Return, Percent | [7] | 12.38% | 7.94% | 7.58% | |||||||||||||
| The Income Fund of America - Class F-2 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-2 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.26% | 7.84% | 6.99% | |||||||||||||
| The Income Fund of America - Class 529-F-1 | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-1 | ||||||||||||||||
| Average Annual Return, Percent | [1] | 11.94% | 7.55% | 6.71% | |||||||||||||
| The Income Fund of America - Class T | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class T (with sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 9.49% | 7.35% | 7.11% | [9] | ||||||||||||
| The Income Fund of America - Class C | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class C (with sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 10.20% | 6.82% | 6.13% | |||||||||||||
| The Income Fund of America - Class A | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class A (with sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 5.57% | 6.35% | 6.16% | |||||||||||||
| Without Sales Load [Member] | The Income Fund of America - Class 529-T | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-T (without sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.25% | 7.84% | 7.42% | [6] | ||||||||||||
| Without Sales Load [Member] | The Income Fund of America - Class 529-C | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-C (without sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [7] | 11.19% | 6.78% | 6.32% | |||||||||||||
| Without Sales Load [Member] | The Income Fund of America - Class 529-A | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-A (without sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [7] | 12.01% | 7.58% | 6.73% | |||||||||||||
| Without Sales Load [Member] | The Income Fund of America - Class T | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class T (without sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.31% | 7.89% | 7.48% | [9] | ||||||||||||
| Without Sales Load [Member] | The Income Fund of America - Class C | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class C (without sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 11.20% | 6.82% | 6.13% | |||||||||||||
| Without Sales Load [Member] | The Income Fund of America - Class A | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class A (without sales charge) | ||||||||||||||||
| Average Annual Return, Percent | [1] | 12.02% | 7.62% | 6.79% | |||||||||||||
| Standard & Poor's 500 Index [Member] | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | ||||||||||||||||
| Average Annual Return, Percent | 22.15% | [10] | 16.78% | [5],[10] | 15% | [10] | 14.32% | [9],[10] | 14.40% | [11] | 13.86% | [10] | 12.82% | [10] | 13.15% | [10] | |
| 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index [Member] | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index | ||||||||||||||||
| Average Annual Return, Percent | [10] | 16.02% | 10.10% | [5] | 9.90% | 9.89% | [9] | 9.97% | 9.65% | 8.98% | 9.23% | ||||||
| Bloomberg U.S. Aggregate Index [Member] | |||||||||||||||||
| Average Annual Return [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | ||||||||||||||||
| Average Annual Return, Percent | [10] | 5.10% | (1.95%) | [5] | 0.19% | 1.32% | [9] | 1.41% | 1.51% | 1.51% | 1.61% | ||||||
| [1]Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.[2]Class R-5E shares were first offered on November 20, 2015.[3]Class R-2E shares were first offered on August 29, 2014.[4]Class 529-F-3 shares were first offered on October 30, 2020.[5]Class 529-F-2 shares were first offered on October 30, 2020.[6]Class 529-T shares were first offered on April 7, 2017.[7]Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.[8]Class F-3 shares were first offered on January 27, 2017.[9]Class T shares were first offered on April 7, 2017.[10]Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): S&P Dow Jones Indices LLC or Bloomberg Index Services Ltd.[11]Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): S&P Dow Jones Indices LLC or Bloomberg Index Services Ltd. | |||||||||||||||||
| Shareholder Report, Holdings (Details) | Jul. 31, 2024 | |
| The Income Fund of America - Class A | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class A | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class A | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class A | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class A | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class A | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class A | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class A | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class A | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class C | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class C | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class C | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class C | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class C | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class C | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class C | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class C | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class C | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class T | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class T | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class T | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class T | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class T | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class T | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class T | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class T | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class T | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class 529-F-1 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class 529-F-1 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class 529-F-1 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class 529-F-1 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class 529-F-1 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class 529-F-1 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class 529-F-1 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class 529-F-1 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class 529-F-1 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class F-2 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class F-2 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class F-2 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class F-2 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class F-2 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class F-2 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class F-2 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class F-2 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class F-2 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | |
| The Income Fund of America - Class F-3 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class F-3 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class F-3 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class F-3 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class F-3 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class F-3 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class F-3 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class F-3 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class F-3 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class 529-A | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class 529-A | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class 529-A | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class 529-A | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class 529-A | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class 529-A | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class 529-A | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class 529-A | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class 529-A | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class 529-C | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class 529-C | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class 529-C | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class 529-C | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class 529-C | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class 529-C | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class 529-C | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class 529-C | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class 529-C | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class 529-E | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class 529-E | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class 529-E | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class 529-E | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class 529-E | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class 529-E | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class 529-E | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class 529-E | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class 529-E | Other Security Investments [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class 529-T | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class 529-T | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class 529-T | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class 529-T | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class 529-T | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class 529-T | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class 529-T | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class 529-T | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class 529-T | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class 529-F-1 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class 529-F-1 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class 529-F-1 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class 529-F-1 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class 529-F-1 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class 529-F-1 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class 529-F-1 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class 529-F-1 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class 529-F-1 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America® Class 529-F-2 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America® Class 529-F-2 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America® Class 529-F-2 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America® Class 529-F-2 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America® Class 529-F-2 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America® Class 529-F-2 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America® Class 529-F-2 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America® Class 529-F-2 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America® Class 529-F-2 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America® Class 529-F-3 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America® Class 529-F-3 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America® Class 529-F-3 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America® Class 529-F-3 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America® Class 529-F-3 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America® Class 529-F-3 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America® Class 529-F-3 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America® Class 529-F-3 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America® Class 529-F-3 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | |
| Income Fund of America® Class R-1 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| Income Fund of America® Class R-1 [Member] | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| Income Fund of America® Class R-1 [Member] | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| Income Fund of America® Class R-1 [Member] | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| Income Fund of America® Class R-1 [Member] | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| Income Fund of America® Class R-1 [Member] | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| Income Fund of America® Class R-1 [Member] | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| Income Fund of America® Class R-1 [Member] | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| Income Fund of America® Class R-1 [Member] | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| Income Fund of America® Class R-2 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| Income Fund of America® Class R-2 [Member] | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| Income Fund of America® Class R-2 [Member] | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| Income Fund of America® Class R-2 [Member] | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| Income Fund of America® Class R-2 [Member] | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| Income Fund of America® Class R-2 [Member] | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| Income Fund of America® Class R-2 [Member] | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| Income Fund of America® Class R-2 [Member] | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| Income Fund of America® Class R-2 [Member] | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| Income Fund of America® Class R-2E [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| Income Fund of America® Class R-2E [Member] | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| Income Fund of America® Class R-2E [Member] | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| Income Fund of America® Class R-2E [Member] | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| Income Fund of America® Class R-2E [Member] | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| Income Fund of America® Class R-2E [Member] | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| Income Fund of America® Class R-2E [Member] | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| Income Fund of America® Class R-2E [Member] | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| Income Fund of America® Class R-2E [Member] | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| Income Fund of America® Class R-3 [Member] | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| Income Fund of America® Class R-3 [Member] | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| Income Fund of America® Class R-3 [Member] | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| Income Fund of America® Class R-3 [Member] | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| Income Fund of America® Class R-3 [Member] | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| Income Fund of America® Class R-3 [Member] | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| Income Fund of America® Class R-3 [Member] | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| Income Fund of America® Class R-3 [Member] | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| Income Fund of America® Class R-3 [Member] | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| Income Fund of America - Class R-4 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| Income Fund of America - Class R-4 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| Income Fund of America - Class R-4 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| Income Fund of America - Class R-4 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| Income Fund of America - Class R-4 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| Income Fund of America - Class R-4 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| Income Fund of America - Class R-4 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| Income Fund of America - Class R-4 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| Income Fund of America - Class R-4 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| Income Fund of America - Class R-5E | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| Income Fund of America - Class R-5E | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| Income Fund of America - Class R-5E | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| Income Fund of America - Class R-5E | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| Income Fund of America - Class R-5E | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| Income Fund of America - Class R-5E | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| Income Fund of America - Class R-5E | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| Income Fund of America - Class R-5E | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| Income Fund of America - Class R-5E | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| Income Fund of America - Class R-5 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| Income Fund of America - Class R-5 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| Income Fund of America - Class R-5 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| Income Fund of America - Class R-5 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| Income Fund of America - Class R-5 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| Income Fund of America - Class R-5 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| Income Fund of America - Class R-5 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| Income Fund of America - Class R-5 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| Income Fund of America - Class R-5 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| The Income Fund of America - Class R-6 | Common Stock [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 70.39% | |
| The Income Fund of America - Class R-6 | Corporate bonds, notes and loans [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15.98% | |
| The Income Fund of America - Class R-6 | Mortgage-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.86% | |
| The Income Fund of America - Class R-6 | U.S. Treasury bonds and notes [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.98% | |
| The Income Fund of America - Class R-6 | Asset-backed obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.55% | |
| The Income Fund of America - Class R-6 | Municipals [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.27% | |
| The Income Fund of America - Class R-6 | Bonds and notes of governments and government agencies outside the U.S. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.17% | |
| The Income Fund of America - Class R-6 | Other securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.21% | |
| The Income Fund of America - Class R-6 | Short Term securities and other assets less liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.59% | [1] |
| [1]Includes derivatives. | ||
