v3.26.1
N-4
Dec. 31, 2025
Prospectus:  
Document Type N-4
Entity Registrant Name MASSACHUSETTS MUTUAL VARIABLE ANNUITY SEPARATE ACCOUNT 4
Entity Central Index Key 0001052766
Entity Investment Company Type N-4
Document Period End Date Dec. 31, 2025
Amendment Flag false
Item 17. Investment Options [Line Items]  
Investment Options (N-4) [Text Block]
Fund Type Fund and Adviser/Sub-Adviser Current Expenses
(expenses/average assets)

Average Annual Total Returns

(as of 12/31/2025)

1 Year 5 Year 10 Year
Small/Mid-Cap Growth

MML VIP Wellington Small Cap Growth Equity Fund (Service Class)

Adviser: MML Investment Advisers, LLC

Sub-Adviser: Wellington Management Company LLP

 1.19%(*) 7.07% 2.41% 10.32%
Variable Option [Line Items]  
Portfolio Companies [Table Text Block]
Fund Type Fund and Adviser/Sub-Adviser Current Expenses
(expenses/average assets)

Average Annual Total Returns

(as of 12/31/2025)

1 Year 5 Year 10 Year
Small/Mid-Cap Growth

MML VIP Wellington Small Cap Growth Equity Fund (Service Class)

Adviser: MML Investment Advisers, LLC

Sub-Adviser: Wellington Management Company LLP

 1.19%(*) 7.07% 2.41% 10.32%
MML VIP Wellington Small Cap Growth Equity Fund (Service Class) [Member]  
Variable Option [Line Items]  
Portfolio Company Name [Text Block] MML VIP Wellington Small Cap Growth Equity Fund (Service Class)
Portfolio Company Adviser [Text Block] MML Investment Advisers, LLC
Portfolio Company Subadviser [Text Block] Wellington Management Company LLP
Current Expenses [Percent] 1.19%
Average Annual Total Returns, 1 Year [Percent] 7.07%
Average Annual Total Returns, 5 Years [Percent] 2.41%
Average Annual Total Returns, 10 Years [Percent] 10.32%