S000055516 [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 |
|
| Northern Trust Core Bond ETF | FlexShares Core Select Bond Fund | |||||||||
| Prospectus [Line Items] | |||||||||
| Annual Return [Percent] | 7.20% | 0.93% | 5.34% | (13.55%) | (1.82%) | 8.75% | 9.29% | (1.27%) | 3.87% |