Shareholder Report, Line Graph (Details) - USD ($) |
6 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended | 21 Months Ended | 24 Months Ended | 30 Months Ended | 33 Months Ended | 36 Months Ended | 42 Months Ended | 45 Months Ended | 48 Months Ended | 54 Months Ended | 57 Months Ended | 60 Months Ended | 66 Months Ended | 69 Months Ended | 72 Months Ended | 78 Months Ended | 84 Months Ended | 90 Months Ended | 96 Months Ended | 102 Months Ended | 108 Months Ended | 114 Months Ended | 120 Months Ended | ||||
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Oct. 30, 2020 |
Jan. 27, 2017 |
Jul. 31, 2016 |
Jul. 31, 2017 |
Jul. 31, 2021 |
Jul. 31, 2026 |
Jul. 31, 2017 |
Jul. 31, 2018 |
Jul. 31, 2022 |
Jul. 31, 2018 |
Jul. 31, 2019 |
Jul. 31, 2023 |
Jul. 31, 2019 |
Jul. 31, 2020 |
Jul. 31, 2024 |
Jul. 31, 2020 |
Jul. 31, 2021 |
Jul. 31, 2025 |
Jul. 31, 2021 |
Jul. 31, 2022 |
Jul. 31, 2026 |
Jul. 31, 2022 |
Jul. 31, 2023 |
Jul. 31, 2023 |
Jul. 31, 2024 |
Jul. 31, 2024 |
Jul. 31, 2025 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2026 |
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| The Income Fund of America - Class A [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class A (with sales charge) | |||||||||||||||||||||||||||||
| Accumulated Value | $ 9,425 | $ 10,240 | $ 10,954 | $ 11,417 | $ 11,713 | $ 14,317 | $ 14,088 | $ 14,714 | $ 16,482 | $ 18,537 | $ 21,462 | |||||||||||||||||||
| The Income Fund of America - Class C [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class C (with sales charge) | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,779 | 11,438 | 11,828 | 12,043 | 14,609 | 14,266 | 14,793 | 16,450 | 18,501 | 21,420 | |||||||||||||||||||
| The Income Fund of America - Class F-1 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-1 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,857 | 11,600 | 12,081 | 12,387 | 15,127 | 14,873 | 15,527 | 17,380 | 19,534 | 22,605 | |||||||||||||||||||
| The Income Fund of America - Class F-2 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-2 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,884 | 11,663 | 12,172 | 12,514 | 15,325 | 15,110 | 15,815 | 17,754 | 20,003 | 23,208 | |||||||||||||||||||
| The Income Fund of America - Class F-3 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class F-3 | |||||||||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 10,530 | $ 11,295 | $ 11,806 | $ 12,145 | $ 14,886 | $ 14,694 | $ 15,395 | $ 17,300 | $ 19,518 | $ 22,668 | |||||||||||||||||||
| The Income Fund of America - Class 529-A [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-A (with sales charge) | |||||||||||||||||||||||||||||
| Accumulated Value | 9,650 | 10,478 | 11,197 | 11,661 | 11,958 | 14,606 | 14,366 | 15,001 | 16,803 | 18,885 | 21,868 | |||||||||||||||||||
| The Income Fund of America - Class 529-C [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-C (with sales charge) | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,774 | 11,427 | 11,812 | 12,023 | 14,580 | 14,340 | 14,974 | 16,773 | 18,850 | 21,829 | |||||||||||||||||||
| The Income Fund of America - Class 529-E [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-E | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,830 | 11,548 | 11,995 | 12,272 | 14,961 | 14,678 | 15,293 | 17,084 | 19,165 | 22,129 | |||||||||||||||||||
| The Income Fund of America - Class 529-F-2 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-2 | |||||||||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 12,424 | $ 12,251 | $ 12,825 | $ 14,403 | $ 16,227 | $ 18,835 | |||||||||||||||||||||||
| The Income Fund of America - Class 529-F-3 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class 529-F-3 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 12,428 | 12,261 | 12,837 | 14,417 | 16,256 | 18,868 | |||||||||||||||||||||||
| The Income Fund of America - Class R-1 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-1 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,776 | 11,432 | 11,818 | 12,025 | 14,581 | 14,242 | 14,758 | 16,404 | 18,302 | 21,026 | |||||||||||||||||||
| The Income Fund of America - Class R-2 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-2 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,776 | 11,433 | 11,818 | 12,026 | 14,583 | 14,236 | 14,751 | 16,398 | 18,301 | 21,021 | |||||||||||||||||||
| The Income Fund of America - Class R-2E [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-2E | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,811 | 11,503 | 11,923 | 12,170 | 14,800 | 14,493 | 15,065 | 16,794 | 18,789 | 21,648 | |||||||||||||||||||
| The Income Fund of America - Class R-3 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-3 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,823 | 11,537 | 11,976 | 12,248 | 14,915 | 14,629 | 15,224 | 17,000 | 19,053 | 21,992 | |||||||||||||||||||
| The Income Fund of America - Class R-4 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-4 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,854 | 11,604 | 12,085 | 12,393 | 15,136 | 14,892 | 15,543 | 17,409 | 19,569 | 22,650 | |||||||||||||||||||
| The Income Fund of America - Class R-5E [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-5E | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,872 | 11,648 | 12,158 | 12,489 | 15,293 | 15,071 | 15,761 | 17,688 | 19,922 | 23,106 | |||||||||||||||||||
| The Income Fund of America - Class R-5 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-5 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,889 | 11,674 | 12,196 | 12,546 | 15,375 | 15,169 | 15,884 | 17,841 | 20,119 | 23,354 | |||||||||||||||||||
| The Income Fund of America - Class R-6 [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | The Income Fund of America — Class R-6 | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,894 | 11,691 | 12,219 | 12,571 | 15,411 | 15,212 | 15,937 | 17,907 | 20,200 | 23,464 | |||||||||||||||||||
| StandardPoors500IndexMember | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,000 | 10,000 | 10,876 | 13,594 | 11,604 | 12,643 | 12,963 | 13,489 | 13,652 | 14,650 | 14,566 | 15,285 | 17,895 | 16,308 | 20,855 | 20,818 | 22,251 | 19,888 | 24,891 | 21,219 | 22,476 | 23,980 | 27,454 | 29,292 | 31,938 | 34,076 | 38,187 | 40,742 | |
| 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | 65%/35% S&P 500 Index/Bloomberg U.S. Aggregate Index | |||||||||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,000 | 10,000 | 10,660 | 12,259 | 11,003 | 11,736 | 11,530 | 12,113 | 12,727 | 12,366 | 13,137 | 14,242 | 14,346 | 14,700 | 17,437 | 16,040 | 17,998 | 16,400 | 18,216 | 16,928 | 17,589 | 18,155 | 20,406 | 21,063 | 22,815 | 23,549 | 25,910 | 26,744 | |
| Bloomberg U.S. Aggregate Index [Member] | ||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | |||||||||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,265 | $ 10,061 | $ 9,949 | $ 10,183 | $ 9,144 | $ 9,869 | $ 11,006 | $ 8,836 | $ 10,666 | $ 12,120 | $ 9,287 | $ 11,746 | $ 12,035 | $ 9,601 | $ 11,664 | $ 10,937 | $ 9,861 | $ 10,600 | $ 10,569 | $ 10,243 | $ 11,108 | $ 10,766 | $ 11,484 | $ 11,130 | $ 11,795 | $ 11,431 | |