v3.25.2
S000008096 [Member] N-1A Cover
Jul. 28, 2025
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name SUNAMERICA SERIES TRUST
Entity Central Index Key 0000892538
Entity Investment Company Type N-1A
Document Period End Date Jul. 28, 2025
Prospectus Date Jul. 28, 2025