Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Oct. 31, 2015 |
Oct. 31, 2025 |
Oct. 31, 2016 |
Oct. 31, 2017 |
Oct. 31, 2018 |
Oct. 31, 2019 |
Oct. 31, 2020 |
Oct. 31, 2021 |
Oct. 31, 2022 |
Oct. 31, 2023 |
Oct. 31, 2024 |
Oct. 31, 2025 |
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| C000149725 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MetLife Core Plus Fund, I Class Shares | |||||||||||||||
| Accumulated Value | $ 5,000,000 | $ 5,265,825 | $ 5,393,993 | $ 5,300,816 | $ 5,904,360 | $ 6,268,913 | $ 6,287,435 | $ 5,225,909 | $ 5,235,797 | $ 5,838,609 | $ 6,223,516 | |||||
| C000149726 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MetLife Core Plus Fund, R Class Shares | |||||||||||||||
| Accumulated Value | 5,000,000 | 5,265,484 | 5,377,625 | 5,279,193 | 5,651,579 | 5,773,256 | 5,815,998 | 4,829,658 | 4,756,458 | 5,157,223 | 5,288,332 | |||||
| Bloomberg U.S. Aggregate Bond Index (USD) (TR) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | [1] | Bloomberg U.S. Aggregate Bond Index (USD) (TR) | ||||||||||||||
| Accumulated Value | 5,000,000 | 5,218,525 | 5,265,611 | 5,157,485 | 5,751,077 | 6,106,914 | 6,077,723 | 5,124,584 | 5,142,825 | 5,685,201 | 6,035,360 | |||||
| Bloomberg U.S. Aggregate Bond Index (USD) (TR) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | [2] | Bloomberg U.S. Aggregate Bond Index (USD) (TR) | ||||||||||||||
| Accumulated Value | $ 5,000,000 | $ 5,218,525 | $ 5,265,611 | $ 5,157,485 | $ 5,751,077 | $ 6,106,914 | $ 6,077,723 | $ 5,124,584 | $ 5,142,825 | $ 5,685,201 | $ 6,035,360 | |||||
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