John Hancock Income Fund S000000648 [Member] Class A C000001863 [Member] Class C C000001865 [Member] Class I C000001866 [Member] Class R2 C000113489 [Member] Class R4 C000078712 [Member] Class R5 C000078713 [Member] Class R6 C000106430 [Member] Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)[Member] Changing Distribution Levels Risk [Member] Credit And Counterparty Risk [Member] Defaulted Debt Risk [Member] Economic And Market Events Risk [Member] Equity Securities Risk [Member] ESG Integration Risk [Member] Fixed Income Securities Risk [Member] Foreign Securities Risk [Member] Hedging Derivatives And Other Strategic Transactions Risk [Member] High Portfolio Turnover Risk [Member] Large Shareholder Risk [Member] Illiquid And Restricted Securities Risk [Member] Liquidity Risk [Member] Loan Participations Risk [Member] Lower Rated And High Yield Fixed Income Securities Risk [Member] Mortgage Backed And Asset Backed Securities Risk [Member] Operational And Cybersecurity Risk [Member] Preferred Stock Risk [Member] Sector Risk [Member] US Government Agency Obligations Risk [Member]