v3.25.2
Investor A C Institutional and Class R [Member] Expense Example - Investor A, C, Institutional and Class R - BLACKROCK GLOBAL ALLOCATION FUND, INC.
Apr. 30, 2025
USD ($)
Investor A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 632
Expense Example, with Redemption, 3 Years 865
Expense Example, with Redemption, 5 Years 1,117
Expense Example, with Redemption, 10 Years 1,836
Investor C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 294
Expense Example, with Redemption, 3 Years 606
Expense Example, with Redemption, 5 Years 1,044
Expense Example, with Redemption, 10 Years 2,054
Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 89
Expense Example, with Redemption, 3 Years 284
Expense Example, with Redemption, 5 Years 496
Expense Example, with Redemption, 10 Years 1,105
Class R  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 150
Expense Example, with Redemption, 3 Years 471
Expense Example, with Redemption, 5 Years 816
Expense Example, with Redemption, 10 Years $ 1,788