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John Hancock Mortgage-Backed Securities ETF Annual Total Returns
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
John Hancock Mortgage-Backed Securities ETF | None or SAME        
Prospectus [Line Items]        
Annual Return [Percent] 8.33% 3.06% 7.48% (10.66%)