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N-4
Oct. 28, 2025
Prospectus:  
Document Type N-4
Entity Registrant Name SEPARATE ACCOUNT VA B
Entity Central Index Key 0000859607
Entity Investment Company Type N-4
Document Period End Date Oct. 28, 2025
Amendment Flag false
Item 17. Investment Options [Line Items]  
Investment Options (N-4) [Text Block]
Underlying Fund Portfolios and Adviser/Sub-adviser Current Expenses

Underlying Fund Portfolios and

Revised Adviser/Sub-adviser

 Revised Current Expenses

Vanguard VIF Diversified Value Portfolio

Advised by: Barrow, Hanley, Mewhinney, & Strauss, LLC

 0.28%

Vanguard VIF Diversified Value Portfolio

Advised by: Aristotle Capital Management, LLC, Harris Associates L.P., and Hotchkis and Wiley Capital Management, LLC

 0.30%
Vanguard VIF Diversified Value Portfolio [Member]  
Variable Option [Line Items]  
Portfolio Company Name [Text Block] Vanguard VIF Diversified Value Portfolio
Portfolio Company Adviser [Text Block] Aristotle Capital Management, LLC, Harris Associates L.P., and Hotchkis and Wiley Capital Management, LLC
Current Expenses [Percent] 0.30%