John Hancock Money Market Fund S000000623 [Member] Class A C [Member] Class A C000001772 [Member] Class C C000001774 [Member] Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)[Member] ICE BofA 3 Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses, or taxes)[Member] Changing Distribution Levels Risk [Member] Credit And Counterparty Risk [Member] Economic And Market Events Risk [Member] Fixed Income Securities Risk [Member] Interest Rate Risk [Member] Liquidity Risk [Member] Operational And Cybersecurity Risk [Member] Redemption Risk [Member] Tax Diversification Risk [Member] US Government Agency Obligations Risk [Member] US Treasury Obligations Risk [Member]