John Hancock Investment Grade Bond Fund Investment Objectives and Goals - John Hancock Bond Trust Class NAV [Member] - John Hancock Investment Grade Bond Fund |
May 31, 2026 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | <span style="color:#000000;font-family:Arial Narrow;font-size:24pt;">John Hancock Investment Grade Bond Fund</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 consistent with preservation of capital and maintenance of liquidity. |