v3.25.4
Form N-1A Cover
Aug. 31, 2025
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name PUTNAM ASSET ALLOCATION FUNDS
Entity Central Index Key 0000914209
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2025
Prospectus Date Jan. 01, 2026