S000046193 [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 Disciplined Duration MBS ETF | FlexShares Disciplined Duration MBS Index Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.13% | 2.22% | 4.62% | (9.54%) | (1.20%) | 5.14% | 5.98% | 0.07% | 1.20% | 1.36% |