v3.26.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 70 Months Ended 115 Months Ended 120 Months Ended
Aug. 31, 2026
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Aug. 31, 2026
U.S. Government Securities Fund® - Class A          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class A (with sales charge)        
Average Annual Return, Percent [1] (3.32%) (1.27%)     0.73%
U.S. Government Securities Fund® - Class C          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class C (with sales charge)        
Average Annual Return, Percent [1] (1.26%) (1.24%)     0.53%
U.S. Government Securities Fund® - Class F-1          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class F-1        
Average Annual Return, Percent [1] 0.40% (0.55%)     1.10%
U.S. Government Securities Fund® - Class F-2          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class F-2        
Average Annual Return, Percent [1] 0.73% (0.23%)     1.40%
U.S. Government Securities Fund® - Class F-3          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class F-3        
Average Annual Return, Percent [1] 0.93% (0.10%)   1.73%  
U.S. Government Securities Fund® - Class 529-A          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class 529-A (with sales charge)        
Average Annual Return, Percent [1] (3.08%) (1.23%)     0.74%
U.S. Government Securities Fund® - Class 529-C          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class 529-C (with sales charge)        
Average Annual Return, Percent [1] (1.25%) (1.29%)     0.73%
U.S. Government Securities Fund® - Class 529-E          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class 529-E        
Average Annual Return, Percent [1] 0.31% (0.73%)     0.88%
U.S. Government Securities Fund® - Class 529-F-2          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class 529-F-2        
Average Annual Return, Percent [1] 0.81% (0.23%) (0.17%) [3]    
U.S. Government Securities Fund® - Class 529-F-3          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class 529-F-3        
Average Annual Return, Percent [1] 0.89% (0.17%) (0.10%) [4]    
U.S. Government Securities Fund® - Class R-1          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-1        
Average Annual Return, Percent [1] (0.26%) (1.19%)     0.41%
U.S. Government Securities Fund® - Class R-2          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-2        
Average Annual Return, Percent [1] (0.17%) (1.19%)     0.43%
U.S. Government Securities Fund® - Class R-2E          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-2E        
Average Annual Return, Percent [1] 0.04% (0.92%)     0.70%
U.S. Government Securities Fund® - Class R-3          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-3        
Average Annual Return, Percent [1] 0.28% (0.76%)     0.85%
U.S. Government Securities Fund® - Class R-4          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-4        
Average Annual Return, Percent [1] 0.58% (0.46%)     1.17%
U.S. Government Securities Fund® - Class R-5E          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-5E        
Average Annual Return, Percent [1] 0.69% (0.27%)     1.37%
U.S. Government Securities Fund® - Class R-5          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-5        
Average Annual Return, Percent [1] 0.87% (0.17%)     1.47%
U.S. Government Securities Fund® - Class R-6          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class R-6        
Average Annual Return, Percent [1] 0.84% (0.12%)     1.51%
Without Sales Load [Member] | U.S. Government Securities Fund® - Class A          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class A (without sales charge)        
Average Annual Return, Percent [1] 0.45% (0.51%)     1.12%
Without Sales Load [Member] | U.S. Government Securities Fund® - Class C          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class C (without sales charge)        
Average Annual Return, Percent [1] (0.29%) (1.24%)     0.53%
Without Sales Load [Member] | U.S. Government Securities Fund® - Class 529-A          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class 529-A (without sales charge)        
Average Annual Return, Percent [1] 0.44% (0.53%)     1.10%
Without Sales Load [Member] | U.S. Government Securities Fund® - Class 529-C          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name U.S. Government Securities Fund — Class 529-C (without sales charge)        
Average Annual Return, Percent [1] (0.28%) (1.29%)     0.73%
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] 1.89% (0.29%) (0.17%) [3],[4] 1.78% 1.40%
Bloomberg U.S. Government/Mortgage Backed Securities Index [Member]          
Average Annual Return [Line Items]          
Line Graph and Table Measure Name Bloomberg U.S. Government/Mortgage Backed Securities Index        
Average Annual Return, Percent [5] 1.84% (0.41%) (0.48%) [3],[4] 1.35% 0.99%
[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): Bloomberg Index Services Ltd.