v3.26.3
Class K [Member] Investment Objectives and Goals - Class K - BLACKROCK GLOBAL DIVIDEND PORTFOLIO
May 31, 2026
Prospectus [Line Items]  
Risk/Return [Heading] Fund Overview Key Facts About BlackRock Global Dividend Portfolio
Objective [Heading] Investment Objective
Objective, Primary [Text Block]
The investment objective of BlackRock Global Dividend Portfolio (the “Fund”), a series of BlackRock Funds II (the Trust), is to seek to provide a level of current income that exceeds the average yield on global stocks generally. Additionally, the Fund seeks to provide long-term capital appreciation.