v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name T. ROWE PRICE EQUITY SERIES, INC.
Entity Central Index Key 0000918294
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000005443  
Shareholder Report [Line Items]  
Fund Name Mid-Cap Growth Portfolio
Class Name Mid-Cap Growth Portfolio Class
Trading Symbol QAMWEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Mid-Cap Growth Portfolio (the "fund") for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information atwww.troweprice.com/prospectus. You can also request this information without charge by contacting T. Rowe Price at 1‑800‑638‑5660 or info@troweprice.com or contacting your intermediary.
Material Fund Change Notice [Text Block]  
Additional Information Phone Number 1‑800‑638‑5660
Additional Information Email <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@troweprice.com</span>
Additional Information Website www.troweprice.com/prospectus
Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Mid-Cap Growth Portfolio Class
$43
0.84%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.84%
Updated Performance Information Location [Text Block]

If you invest directly with T. Rowe Price, you can elect to receive future shareholder reports or other important documents through electronic delivery by enrolling at www.troweprice.com/paperless. If you invest through a financial intermediary such as an investment advisor, a bank, retirement plan sponsor or a brokerage firm, please contact that organization and ask if it can provide electronic delivery.

Visit www.troweprice.com/en/us/market-data-disclosures for additional legal notices & disclaimers.
AssetsNet $ 430,356,000
Holdings Count | Holding 134
InvestmentCompanyPortfolioTurnover 38.00%
Additional Fund Statistics [Text Block]

What are some fund statistics?

Fund Statistics

Table Summary
Total Net Assets (000s)
$430,356
Number of Portfolio Holdings
134
Additional Fund Statistics Significance or Limits [Text Block]
Table Summary
Portfolio Turnover Rate
38.0%
Holdings [Text Block]

Sector Allocation (as a % of Net Assets)

Table Summary
Information Technology
26.9%
Industrials & Business Services
19.5
Health Care
18.3
Consumer Discretionary
13.6
Financials
6.6
Energy
3.9
Consumer Staples
3.4
Communication Services
3.2
Materials
1.5
Other
3.1
Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

Table Summary
Agilent Technologies
2.4%
Keysight Technologies
2.1
Mettler-Toledo International
2.0
Teradyne
2.0
MACOM Technology Solutions Holdings
2.0
Datadog
1.9
Yum! Brands
1.8
Burlington Stores
1.7
Lattice Semiconductor
1.7
Assurant
1.5
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless
C000005444  
Shareholder Report [Line Items]  
Fund Name Mid-Cap Growth Portfolio
Class Name Mid-Cap Growth Portfolio - II Class
Trading Symbol QAAGSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Mid-Cap Growth Portfolio (the "fund") for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information atwww.troweprice.com/prospectus. You can also request this information without charge by contacting T. Rowe Price at 1‑800‑638‑5660 or info@troweprice.com or contacting your intermediary.
Material Fund Change Notice [Text Block]  
Additional Information Phone Number 1‑800‑638‑5660
Additional Information Email <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@troweprice.com</span>
Additional Information Website www.troweprice.com/prospectus
Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Mid-Cap Growth Portfolio - II Class
$55
1.09%
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.09%
Updated Performance Information Location [Text Block]

If you invest directly with T. Rowe Price, you can elect to receive future shareholder reports or other important documents through electronic delivery by enrolling at www.troweprice.com/paperless. If you invest through a financial intermediary such as an investment advisor, a bank, retirement plan sponsor or a brokerage firm, please contact that organization and ask if it can provide electronic delivery.

Visit www.troweprice.com/en/us/market-data-disclosures for additional legal notices & disclaimers.
AssetsNet $ 430,356,000
Holdings Count | Holding 134
InvestmentCompanyPortfolioTurnover 38.00%
Additional Fund Statistics [Text Block]

What are some fund statistics?

Fund Statistics

Table Summary
Total Net Assets (000s)
$430,356
Number of Portfolio Holdings
134
Additional Fund Statistics Significance or Limits [Text Block]
Table Summary
Portfolio Turnover Rate
38.0%
Holdings [Text Block]

Sector Allocation (as a % of Net Assets)

Table Summary
Information Technology
26.9%
Industrials & Business Services
19.5
Health Care
18.3
Consumer Discretionary
13.6
Financials
6.6
Energy
3.9
Consumer Staples
3.4
Communication Services
3.2
Materials
1.5
Other
3.1
Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

Table Summary
Agilent Technologies
2.4%
Keysight Technologies
2.1
Mettler-Toledo International
2.0
Teradyne
2.0
MACOM Technology Solutions Holdings
2.0
Datadog
1.9
Yum! Brands
1.8
Burlington Stores
1.7
Lattice Semiconductor
1.7
Assurant
1.5
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless