Class I [Member] Annual Total Returns |
12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Class I | Putnam Government Money Market Fund | Class I Shares | |||||||||
| Prospectus [Line Items] | |||||||||
| Annual Return [Percent] | 4.06% | 5.01% | 4.79% | 1.35% | 0.01% | 0.24% | 1.82% | 1.47% | 0.43% |