v3.26.1
Cover
12 Months Ended
Dec. 31, 2025
Document Information [Line Items]  
Document Type 11-K
Amendment Flag false
Entity Registrant Name BANK OF MONTREAL /CAN/
Entity Central Index Key 0000927971
EBP 001 [Member]  
Document Information [Line Items]  
Document Type 11-K
Amendment Flag false
Document Period End Date Dec. 31, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Registrant Name BANK OF MONTREAL /CAN/
Entity Central Index Key 0000927971
Current Fiscal Year End Date --12-31