v3.26.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 69 Months Ended 114 Months Ended 120 Months Ended
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2026
 [2]
Jul. 31, 2026
The Income Fund of America - Class A [Member]          
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] 9.12% 7.16%     7.94%
The Income Fund of America - Class C [Member]          
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] 13.96% 7.63%     7.92%
The Income Fund of America - Class F-1 [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class F-1        
Average Annual Return, Percent [1] 15.72% 8.37%     8.50%
The Income Fund of America - Class F-2 [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class F-2        
Average Annual Return, Percent [1] 16.03% 8.66%     8.78%
The Income Fund of America - Class F-3 [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class F-3        
Average Annual Return, Percent [1] 16.14% 8.77%   8.98%  
The Income Fund of America - Class 529-A [Member]          
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 [1] 11.75% 7.64%     8.14%
The Income Fund of America - Class 529-C [Member]          
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 [1] 13.84% 7.58%     8.12%
The Income Fund of America - Class 529-E [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class 529-E        
Average Annual Return, Percent [1] 15.47% 8.14%     8.27%
The Income Fund of America - Class 529-F-2 [Member]          
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] 16.07% 8.68% 11.63% [3]    
The Income Fund of America - Class 529-F-3 [Member]          
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] 16.07% 8.71% 11.67% [4]    
The 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] 14.88% 7.60%     7.72%
The 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] 14.87% 7.59%     7.71%
The 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] 15.22% 7.90%     8.03%
The 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] 15.43% 8.08%     8.20%
The Income Fund of America - Class R-4 [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class R-4        
Average Annual Return, Percent [1] 15.74% 8.40%     8.52%
The Income Fund of America - Class R-5E [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class R-5E        
Average Annual Return, Percent [1] 15.98% 8.60%     8.74%
The Income Fund of America - Class R-5 [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class R-5        
Average Annual Return, Percent [1] 16.08% 8.72%     8.85%
The Income Fund of America - Class R-6 [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name The Income Fund of America — Class R-6        
Average Annual Return, Percent [1] 16.16% 8.77%     8.90%
Without Sales Load [Member] | The Income Fund of America - Class A [Member]          
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] 15.78% 8.43%     8.58%
Without Sales Load [Member] | The Income Fund of America - Class C [Member]          
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] 14.96% 7.63%     7.92%
Without Sales Load [Member] | The Income Fund of America - Class 529-A [Member]          
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 [1] 15.80% 8.41%     8.52%
Without Sales Load [Member] | The Income Fund of America - Class 529-C [Member]          
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 [1] 14.84% 7.58%     8.12%
StandardPoors500IndexMember          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name S&P 500 Index        
Average Annual Return, Percent [5] 19.56% 12.86% 17.17% [3],[4] 15.13% 15.08%
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 [5] 2.71% (0.40%) (0.24%) [3],[4] 1.75% 1.35%
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 [5] 13.57% 8.24% 10.99% [3],[4] 10.53% 10.34%
[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 F-3 shares were first offered on January 27, 2017.
[3] Class 529-F-2 shares were first offered on October 30, 2020.
[4] Class 529-F-3 shares were first offered on October 30, 2020.
[5] 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 and Bloomberg Index Services Ltd.