v3.26.3
John Hancock Investment Grade Bond Fund N-1A Cover
May 31, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name JOHN HANCOCK BOND TRUST
Entity Central Index Key 0000315554
Entity Investment Company Type N-1A
Document Period End Date May 31, 2026
Prospectus Date Oct. 01, 2026