John Hancock Investment Grade Bond Fund Average Annual Total Returns - John Hancock Bond Trust Class NAV [Member] |
12 Months Ended | 60 Months Ended | 66 Months Ended | 120 Months Ended |
|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)[Member] | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 1.25% | (0.33%) | 0.19% | 1.35% |
| Class NAV | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 1.58% | (0.34%) | 1.29% | |
| Class NAV | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | (0.06%) | (1.63%) | 0.05% | |
| Class NAV | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 0.93% | (0.77%) | 0.46% |