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John Hancock Short Duration Bond Fund Annual Total Returns
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
John Hancock Bond Trust Class NAV [Member] | John Hancock Short Duration Bond Fund | Class NAV            
Prospectus [Line Items]            
Annual Return [Percent] 6.11% 5.58% 6.13% (3.84%) 1.31% 4.26%