S000050613 [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 |
Dec. 31, 2016 |
|
| Northern Trust Credit-Scored US Long Corporate Bond ETF | FlexShares Credit-Scored US Long Corporate Bond Index Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.27% | (1.00%) | 12.39% | (26.34%) | (1.07%) | 16.27% | 24.23% | (7.92%) | 12.03% | 9.95% |