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John Hancock Mortgage-Backed Securities ETF Investment Objectives and Goals - John Hancock Mortgage-Backed Securities ETF
Mar. 31, 2026
Prospectus [Line Items]  
Risk/Return [Heading] <span style="color:#000000;font-family:Arial Narrow;font-size:24pt;">John Hancock Mortgage-Backed Securities ETF</span>
Objective [Heading] <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Investment objective</span>
Objective, Primary [Text Block] To seek a high level of current income while seeking to outperform the benchmark over a market cycle.