v3.25.4
S000000778 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 3000 Index (no deduction for fees, expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 17.15% 13.15% 14.29%
Putnam Balanced Blended Benchmark (no deduction for fees, expenses or taxes, other than withholding taxes on reinvested dividends in the case of the MSCI EAFE Index- NR)      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 14.67% 7.63% 9.14%
Class P      
Prospectus [Line Items]      
Average Annual Return, Percent [2] 15.28% 8.80% 8.86%
Class A      
Prospectus [Line Items]      
Average Annual Return, Percent 8.27% 7.12% 7.82%
Class A | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 5.50% 4.62% 5.93%
Class A | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 5.32% 4.70% 5.60%
Class C      
Prospectus [Line Items]      
Average Annual Return, Percent 13.03% 7.59% 7.81%
Class R      
Prospectus [Line Items]      
Average Annual Return, Percent 14.63% 8.13% 8.19%
Class Y      
Prospectus [Line Items]      
Average Annual Return, Percent 15.14% 8.67% 8.73%
Class R5      
Prospectus [Line Items]      
Average Annual Return, Percent 15.07% 8.64% 8.72%
Class R6      
Prospectus [Line Items]      
Average Annual Return, Percent 15.18% 8.75% 8.82%
[1]
Effective February 1, 2026, the Putnam Balanced Blended Benchmark composition changed from 50% Russell 3000® Index, 35% Bloomberg U.S. Aggregate Bond Index, 10% MSCI EAFE Index-NR and 5% JPMorgan Developed High Yield Index (the “Prior Composition”) to 48% Russell 3000® Index, 32% Bloomberg U.S. Aggregate Bond Index, 12% MSCI All Country World Ex-U.S. Index-NR, 6% Bloomberg Global Aggregate ex-USD Index Hedged USD and 2% Bloomberg U.S. Corporate High Yield Index (the “New Composition”). The fund’s Investment Manager believes the New Composition better reflects the fund’s current portfolio.
[2]
Performance for class P shares prior to their inception (8/31/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class P shares; had it been adjusted, returns would have been higher.