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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$61	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 A shares gained 12.02% 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-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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$139	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class T	$34	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 inception1
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 Index3	22.15	15.00	14.32
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index3	16.02	9.90	9.89
Bloomberg U.S. Aggregate Index3	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 Class T shares were first offered on April 7, 2017.

2 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.

3 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F-1	$68	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F-2	$39	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F-3	$29	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 inception1
The Income Fund of America — Class F-32	12.38%	7.94%	7.58%
S&P 500 Index3	22.15	15.00	14.40
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index3	16.02	9.90	9.97
Bloomberg U.S. Aggregate Index3	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 Class F-3 shares were first offered on January 27, 2017.

2 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.

3 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 529-A	$65	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 529-C	$144	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 529-E	$89	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 529-T	$39	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 inception1
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 Index3	22.15	15.00	14.32
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index3	16.02	9.90	9.89
Bloomberg U.S. Aggregate Index3	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 Class 529-T shares were first offered on April 7, 2017.

2 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.

3 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 529-F-1	$48	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 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-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 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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 529-F-2	$38	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 inception1
The Income Fund of America — Class 529-F-22	12.30%	10.22%
S&P 500 Index3	22.15	16.78
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index3	16.02	10.10
Bloomberg U.S. Aggregate Index3	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 Class 529-F-2 shares were first offered on October 30, 2020.

2 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.

3 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 529-F-3	$34	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, 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-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 inception1
The Income Fund of America — Class 529-F-32	12.31%	10.24%
S&P 500 Index3	22.15	16.78
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index3	16.02	10.10
Bloomberg U.S. Aggregate Index3	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 Class 529-F-3 shares were first offered on October 30, 2020.

2 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.

3 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-1	$143	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 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 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 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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-2	$143	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 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-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 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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-2E	$113	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 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 inception1
The Income Fund of America — Class R-2E2	11.47%	7.09%	6.08%
S&P 500 Index3	22.15	15.00	12.82
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index3	16.02	9.90	8.98
Bloomberg U.S. Aggregate Index3	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 Class R-2E shares were first offered on August 29, 2014.

2 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.

3 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-3	$96	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 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 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, 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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Key fund statistics

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-4	$65	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-5E	$44	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 inception1
The Income Fund of America — Class R-5E2	12.22%	7.79%	7.69%
S&P 500 Index3	22.15	15.00	13.86
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index3	16.02	9.90	9.65
Bloomberg U.S. Aggregate Index3	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 Class R-5E shares were first offered on November 20, 2015.

2 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.

3 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.

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

92.00%

Additional Fund Statistics [Text Block]

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-5	$33	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*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") for the period from August 1, 2023 to July 31, 2024.

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. You can also request this information by contacting us at (800) 421-4225.

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? (based on a hypothetical $10,000 investment)

Share class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R-6	$29	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.

* 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.

† 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.

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

92.00%

Additional Fund Statistics [Text Block]

Fund net assets (in millions)	$125,420
Total number of portfolio holdings	2,704
Total advisory fees paid (in millions)	$270
Portfolio turnover rate including mortgage dollar roll transactions	92%
Portfolio turnover rate excluding mortgage dollar roll transactions	43%

Holdings [Text Block]

Portfolio holdings by asset type (percent of net assets)

*Includes derivatives.