v3.26.1
Shareholder Report
 6 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Tax-Managed Value Portfolio
Entity Central Index Key 0001140883
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000014305  
Shareholder Report [Line Items]  
Fund Name Tax-Managed Value Portfolio
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Tax-Managed Value Portfolio (the "Fund") for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php and selecting Eaton Vance Tax-Managed Value Fund. You can also request this information by contacting us at 1-800-262-1122.
Additional Information Phone Number 1-800-262-1122
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.eatonvance.com/open-end-mutual-fund-documents.php</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Tax-Managed Value Portfolio
$36
0.68%Footnote Reference1
Footnote Description
Footnote1
 Annualized
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.68% [1]
AssetsNet $ 1,173,783,340
Holdings Count | Holding 71
InvestmentCompanyPortfolioTurnover 10.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$1,173,783,340
# of Portfolio Holdings
71
Portfolio Turnover Rate
10%
Holdings [Text Block]

Sector Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Short-Term Investments
0.3%
Real Estate
0.8%
Consumer Staples
4.3%
Materials
5.3%
Utilities
5.5%
Communication Services
6.9%
Energy
8.5%
Consumer Discretionary
9.7%
Health Care
10.3%
Information Technology
13.5%
Industrials
14.6%
Financials
20.3%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Micron Technology, Inc.
5.3%
Alphabet, Inc., Class A
4.4%
Chevron Corp.
4.1%
JPMorgan Chase & Co.
3.5%
Amazon.com, Inc.
3.3%
Intel Corp.
3.3%
PNC Financial Services Group, Inc.
2.7%
Parker-Hannifin Corp.
2.6%
Westinghouse Air Brake Technologies Corp.
2.5%
NextEra Energy, Inc.
2.5%
Total
34.2%
Footnote Description
Footnotea
 Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-262-1122
[1] Annualized