Shareholder Report, Average Annual Return (Details)		12 Months Ended		45 Months Ended		60 Months Ended		88 Months Ended		90 Months Ended		104 Months Ended		119 Months Ended		120 Months Ended
		Jul. 31, 2024		Jul. 31, 2024		Jul. 31, 2024		Jul. 31, 2024		Jul. 31, 2024	[8]	Jul. 31, 2024	[2]	Jul. 31, 2024	[3]	Jul. 31, 2024
The Income Fund of America - Class R-6
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-6
Average Annual Return, Percent	[1]	12.36%				7.94%										7.10%
Income Fund of America - Class R-5
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-5
Average Annual Return, Percent	[1]	12.32%				7.91%										7.05%
Income Fund of America - Class R-5E
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-5E
Average Annual Return, Percent	[1]	12.22%				7.79%						7.69%
Income Fund of America - Class R-4
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-4
Average Annual Return, Percent	[1]	12.01%				7.57%										6.73%
Income Fund of America® Class R-3 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-3
Average Annual Return, Percent	[1]	11.66%				7.26%										6.41%
Income Fund of America® Class R-2E [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-2E
Average Annual Return, Percent	[1]	11.47%				7.09%								6.08%
Income Fund of America® Class R-2 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-2
Average Annual Return, Percent	[1]	11.16%				6.77%										5.94%
Income Fund of America® Class R-1 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class R-1
Average Annual Return, Percent	[1]	11.15%				6.78%										5.94%
The Income Fund of America® Class 529-F-3
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-F-3
Average Annual Return, Percent	[1]	12.31%		10.24%	[4]
The Income Fund of America® Class 529-F-2
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-F-2
Average Annual Return, Percent	[1]	12.30%		10.22%	[5]
The Income Fund of America - Class 529-F-1
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-F-1
Average Annual Return, Percent	[1]	12.20%				7.78%										6.95%
The Income Fund of America - Class 529-T
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-T (with sales charge)
Average Annual Return, Percent	[1]	9.43%				7.29%		7.05%	[6]
The Income Fund of America - Class 529-E
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-E
Average Annual Return, Percent	[7]	11.71%				7.33%										6.48%
The Income Fund of America - Class 529-C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-C (with sales charge)
Average Annual Return, Percent	[7]	10.19%				6.78%										6.32%
The Income Fund of America - Class 529-A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-A (with sales charge)
Average Annual Return, Percent	[7]	8.10%				6.81%										6.35%
The Income Fund of America - Class F-3
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class F-3
Average Annual Return, Percent	[7]	12.38%				7.94%				7.58%
The Income Fund of America - Class F-2
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class F-2
Average Annual Return, Percent	[1]	12.26%				7.84%										6.99%
The Income Fund of America - Class 529-F-1
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class F-1
Average Annual Return, Percent	[1]	11.94%				7.55%										6.71%
The Income Fund of America - Class T
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class T (with sales charge)
Average Annual Return, Percent	[1]	9.49%				7.35%		7.11%	[9]
The Income Fund of America - Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class C (with sales charge)
Average Annual Return, Percent	[1]	10.20%				6.82%										6.13%
The Income Fund of America - Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class A (with sales charge)
Average Annual Return, Percent	[1]	5.57%				6.35%										6.16%
Without Sales Load [Member] | The Income Fund of America - Class 529-T
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-T (without sales charge)
Average Annual Return, Percent	[1]	12.25%				7.84%		7.42%	[6]
Without Sales Load [Member] | The Income Fund of America - Class 529-C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-C (without sales charge)
Average Annual Return, Percent	[7]	11.19%				6.78%										6.32%
Without Sales Load [Member] | The Income Fund of America - Class 529-A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class 529-A (without sales charge)
Average Annual Return, Percent	[7]	12.01%				7.58%										6.73%
Without Sales Load [Member] | The Income Fund of America - Class T
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class T (without sales charge)
Average Annual Return, Percent	[1]	12.31%				7.89%		7.48%	[9]
Without Sales Load [Member] | The Income Fund of America - Class C
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class C (without sales charge)
Average Annual Return, Percent	[1]	11.20%				6.82%										6.13%
Without Sales Load [Member] | The Income Fund of America - Class A
Average Annual Return [Line Items]
Line Graph and Table Measure Name		The Income Fund of America — Class A (without sales charge)
Average Annual Return, Percent	[1]	12.02%				7.62%										6.79%
Standard & Poor's 500 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		S&P 500 Index
Average Annual Return, Percent		22.15%	[10]	16.78%	[5],[10]	15.00%	[10]	14.32%	[9],[10]	14.40%	[11]	13.86%	[10]	12.82%	[10]	13.15%	[10]
65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index
Average Annual Return, Percent	[10]	16.02%		10.10%	[5]	9.90%		9.89%	[9]	9.97%		9.65%		8.98%		9.23%
Bloomberg U.S. Aggregate Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Bloomberg U.S. Aggregate Index
Average Annual Return, Percent	[10]	5.10%		(1.95%)	[5]	0.19%		1.32%	[9]	1.41%		1.51%		1.51%		1.61%

[1] Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.

[2] Class R-5E shares were first offered on November 20, 2015.

[3] Class R-2E shares were first offered on August 29, 2014.

[4] Class 529-F-3 shares were first offered on October 30, 2020.

[5] Class 529-F-2 shares were first offered on October 30, 2020.

[6] Class 529-T shares were first offered on April 7, 2017.

[7] Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.

[8] Class F-3 shares were first offered on January 27, 2017.

[9] Class T shares were first offered on April 7, 2017.

[10] Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): S&P Dow Jones Indices LLC or Bloomberg Index Services Ltd.

[11] Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): S&P Dow Jones Indices LLC or Bloomberg Index Services Ltd.