v3.26.1
Investor A C Institutional and Class R [Member] Expense Example - Investor A, C, Institutional and Class R - BLACKROCK GLOBAL ALLOCATION FUND, INC.
Apr. 30, 2026
USD ($)
Investor A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 631
Expense Example, with Redemption, 3 Years 862
Expense Example, with Redemption, 5 Years 1,112
Expense Example, with Redemption, 10 Years 1,825
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 2,052
Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 88
Expense Example, with Redemption, 3 Years 283
Expense Example, with Redemption, 5 Years 495
Expense Example, with Redemption, 10 Years 1,104
Class R  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 151
Expense Example, with Redemption, 3 Years 476
Expense Example, with Redemption, 5 Years 825
Expense Example, with Redemption, 10 Years $ 1,809