Annual Fund Operating Expenses - INCOME FUND OF AMERICA	Jul. 31, 2024
Class A
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.25%
Other Expenses (as a percentage of Assets):	0.10%
Expenses (as a percentage of Assets)	0.58%
Class 529-A
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.23%
Other Expenses (as a percentage of Assets):	0.15%
Expenses (as a percentage of Assets)	0.61%
Class C
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	1.00%
Other Expenses (as a percentage of Assets):	0.10%
Expenses (as a percentage of Assets)	1.33%
Class 529-C
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.98%
Other Expenses (as a percentage of Assets):	0.15%
Expenses (as a percentage of Assets)	1.36%
Class 529-E
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.49%
Other Expenses (as a percentage of Assets):	0.12%
Expenses (as a percentage of Assets)	0.84%
Class 529-T
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.25%
Other Expenses (as a percentage of Assets):	0.14%
Expenses (as a percentage of Assets)	0.62%
Class T
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.25%
Other Expenses (as a percentage of Assets):	0.09%
Expenses (as a percentage of Assets)	0.57%
Class F-1
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.25%
Other Expenses (as a percentage of Assets):	0.17%
Expenses (as a percentage of Assets)	0.65%
Class F-2
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.14%
Expenses (as a percentage of Assets)	0.37%
Class F-3
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.04%
Expenses (as a percentage of Assets)	0.27%
Class 529-F-1
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.25%
Other Expenses (as a percentage of Assets):	0.22%
Expenses (as a percentage of Assets)	0.70%
Class 529-F-2
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.13%
Expenses (as a percentage of Assets)	0.36%
Class 529-F-3
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.09%
Expenses (as a percentage of Assets)	0.32%
Class R-1
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	1.00%
Other Expenses (as a percentage of Assets):	0.13%
Expenses (as a percentage of Assets)	1.36%
Class R-2
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.75%
Other Expenses (as a percentage of Assets):	0.38%
Expenses (as a percentage of Assets)	1.36%
Class R-3
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.50%
Other Expenses (as a percentage of Assets):	0.18%
Expenses (as a percentage of Assets)	0.91%
Class R-4
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.25%
Other Expenses (as a percentage of Assets):	0.14%
Expenses (as a percentage of Assets)	0.62%
Class R-5
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.08%
Expenses (as a percentage of Assets)	0.31%
Class R-6
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.04%
Expenses (as a percentage of Assets)	0.27%
Class R-2E
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.60%
Other Expenses (as a percentage of Assets):	0.24%
Expenses (as a percentage of Assets)	1.07%
Class R-5E
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.23%
Distribution and Service (12b-1) Fees	0.00%
Other Expenses (as a percentage of Assets):	0.18%
Expenses (as a percentage of Assets)	0.41%