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Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended
Aug. 31, 2024
Feb. 29, 2024
Aug. 31, 2023
Feb. 28, 2023
Aug. 31, 2022
Feb. 28, 2022
Aug. 31, 2021
Feb. 28, 2021
Oct. 30, 2020
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Apr. 07, 2017
Jan. 27, 2017
Aug. 31, 2016
Nov. 20, 2015
Aug. 31, 2015
Aug. 31, 2014
Intermediate Bond Fund of America® - Class 529-F-1 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class 529-F-1                                    
Account Value $ 11,754   $ 10,965   $ 11,043   $ 11,781     $ 11,717 $ 10,937 $ 10,338 $ 10,442     $ 10,328   $ 10,116 $ 10,000
Intermediate Bond Fund of America® - Class 529-T [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class 529-T (with sales charge)                                    
Account Value $ 11,148   10,393   10,460   11,147     11,091 10,352 9,786 9,883 $ 9,752          
Intermediate Bond Fund of America® - Class 529-E [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class 529-E                                    
Account Value $ 11,296   10,566   10,681   11,438     11,420 10,704 10,161 10,307     10,239   10,072 10,000
Intermediate Bond Fund of America® - Class 529-C [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class 529-C (with sales charge)                                    
Account Value $ 11,099   10,364   10,457   11,176     11,138 10,421 9,944 10,134     10,128   10,017 10,000
Intermediate Bond Fund of America® - Class 529-A [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class 529-A (with sales charge)                                    
Account Value $ 11,224   10,480   10,575   11,302     11,264 10,538 9,985 10,109     10,022   9,839 9,748
Intermediate Bond Fund of America® - Class R-5E [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class R-5E                                    
Account Value $ 11,677   10,876   10,946   11,671     11,603 10,829 10,234 10,330     10,207 $ 10,000    
Intermediate Bond Fund of America® - Class R-4 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class R-4                                    
Account Value $ 11,584   10,810   10,900   11,646     11,601 10,856 10,272 10,393     10,298   10,102 10,000
Intermediate Bond Fund of America® Class R-3 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class R-3                                    
Account Value $ 11,239   10,519   10,639   11,400     11,390 10,683 10,146 10,298     10,234   10,070 10,000
Intermediate Bond Fund of America® Class R-2E [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class R-2E                                    
Account Value $ 11,135   10,445   10,572   11,346     11,354 10,673 10,154 10,324     10,277   10,109 10,000
Intermediate Bond Fund of America® Class R-2 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name [1] Intermediate Bond Fund of America — Class R-2                                    
Account Value $ 10,751   10,112   10,263   11,047     11,083 10,448 9,967 10,152     10,141   10,023 10,000
Intermediate Bond Fund of America® Class R-1 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class R-1                                    
Account Value $ 10,741   10,103   10,255   11,039     11,077 10,446 9,967 10,162     10,144   10,025 10,000
Intermediate Bond Fund of America® Class 529-F-3 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class 529-F-3                                    
Account Value $ 10,101 $ 9,648 9,399 $ 9,295 9,451 $ 9,875 10,067 $ 10,007 $ 10,000                    
Intermediate Bond Fund of America® - Class 529-F-2 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class 529-F-2                                    
Account Value $ 10,087 $ 9,645 9,390 $ 9,288 9,444 $ 9,877 10,064 $ 10,006 $ 10,000                    
Intermediate Bond Fund of America® - Class F-3 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class F-3                                    
Account Value $ 11,621   10,815   10,860   11,563     11,479 10,704 10,101 10,186   $ 10,000        
Intermediate Bond Fund of America® - Class F-2 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class F-2                                    
Account Value $ 11,861   11,043   11,110   11,842     11,768 10,980 10,370 10,467     10,346   10,125 10,000
Intermediate Bond Fund of America® - Class F-1 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class F-1                                    
Account Value $ 11,524   10,762   10,858   11,607     11,567 10,829 10,253 10,379     10,289   10,097 10,000
Intermediate Bond Fund of America® - Class T [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class T (with sales charge)                                    
Account Value $ 11,200   10,436   10,496   11,176     11,107 10,368 9,794 9,885 9,752          
Intermediate Bond Fund of America® - Class R-6 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class R-6                                    
Account Value $ 11,995   11,155   11,210   11,926     11,847 11,040 10,417 10,503     10,370   10,137 10,000
Intermediate Bond Fund of America® - Class R-5 [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class R-5                                    
Account Value $ 11,932   11,102   11,162   11,890     11,809 11,018 10,394 10,486     10,359   10,131 10,000
Intermediate Bond Fund of America® - Class C [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class C (with sales charge)                                    
Account Value $ 10,894   10,173   10,261   11,038     11,076 10,442 9,963 10,158     10,140   10,024 10,000
Intermediate Bond Fund of America® - Class A [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name Intermediate Bond Fund of America — Class A (with sales charge)                                    
Account Value $ 11,269   10,522   10,614   11,345     11,307 10,578 10,018 10,134     10,040   9,848 9,748
Bloomberg US Aggregate Index [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name [2] Bloomberg U.S. Aggregate Index                                    
Account Value $ 11,765   10,965   11,098   12,542     12,553 11,789 10,701 10,814 10,000   10,761 10,000 10,156 10,000
Bloomberg U S Government Or Credit 1 To 7 Year Ex BBB Index [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name [2] Bloomberg U.S. Government/Credit 1-7 Year Ex BBB Index                                    
Account Value $ 11,688   10,965   10,897   11,703     11,719 11,129 10,425 10,513 10,000 10,000 10,450 10,000 10,163 10,000
Bloomberg 75 Percent Government Credit 1 To 7 Years 25 Percent Securitized Index [Member]                                      
Account Value [Line Items]                                      
Line Graph and Table Measure Name [2] Bloomberg 75% Government Credit 1-7 Years 25% Securitized Index                                    
Account Value $ 11,784   $ 11,002   $ 10,983   $ 11,898     $ 11,876 $ 11,286 $ 10,540 $ 10,612 $ 10,000 $ 10,000 $ 10,518 $ 10,000 $ 10,175 $ 10,000
[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] 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): Bloomberg Index Services Ltd.