John Hancock Large Cap Opportunities ETF S000102317 [Member] None or SAME C000272786 [Member] Active Trading Market Risk [Member] American Depositary Receipts ADRs risk [Member] Authorized Participant Concentration Risk [Member] Cash Transactions Risk [Member] Economic And Market Events Risk [Member] Equity Securities Risk [Member] ESG Integration Risk [Member] ETF Trading Risk [Member] Initial Public Offerings Risk [Member] Investing In Developed Countries Risk [Member] Large Company Risk [Member] Liquidity Risk [Member] Operational And Cybersecurity Risk [Member] Preferred Stock Risk [Member] Premium Discount Risk [Member] Real Estate Investment Trust Risk [Member] Trading Issues Risk [Member] Value Investment Style Risk [Member]