v3.26.3
Shareholder Report, Average Annual Return (Details) 74200171800_George Putnam Balanced Fund_Class Y_TSR Annual {Class Y}
 12 Months Ended 60 Months Ended 120 Months Ended
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2026
Class Y      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Class Y    
Average Annual Return, Percent 15.31% 8.58% 10.59%
Russell 3000 Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name Russell 3000 Index    
Average Annual Return, Percent 19.60% 11.82% 14.56%
George Putnam Blended Index [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name George Putnam Blended Index    
Average Annual Return, Percent [1] 12.72% 7.73% 9.83%
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 2.71% (0.40%) 1.35%
[1]
† The George Putnam Blended Index is comprised of 60% S&P 500 Index and 40% Bloomberg U.S. Aggregate Index.