S000070577 [Member] Annual Total Returns |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Putnam Sustainable Retirement 2065 Fund | Class A | |||||
| Prospectus [Line Items] | |||||
| Annual Return [Percent] | 13.68% | 16.53% | 23.25% | (16.33%) | 17.93% |