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 Global Macro Capital Opportunities Portfolio
Entity Central Index Key 0001588812
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000134926  
Shareholder Report [Line Items]  
Fund Name Global Macro Capital Opportunities Portfolio
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Global Macro Capital Opportunities 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 Emerging and Frontier Countries Equity 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
Global Macro Capital Opportunities Portfolio
$56
1.04%Footnote Reference1
Footnote Description
Footnote1
Annualized
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.04% [1]
AssetsNet $ 3,722,011,197
Holdings Count | Holding 574
InvestmentCompanyPortfolioTurnover 20.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$3,722,011,197
# of Portfolio Holdings
574
Portfolio Turnover Rate
20%
Holdings [Text Block]

Country Allocation (% of total investments)

Group By Asset Type Chart
Table Summary
Value
Value
Other
29.2%
India
3.7%
South Africa
3.9%
Brazil
4.5%
Argentina
4.6%
Chile
5.1%
United States
5.2%
Taiwan
8.2%
Greece
8.8%
Vietnam
11.6%
South Korea
15.2%
Largest Holdings [Text Block]

Top Ten Holdings (% of total investments)Footnote Referencea

Table Summary
Samsung Electronics Co. Ltd.
6.3%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.4%
SK Hynix, Inc.
4.3%
OTP Bank Nyrt
2.6%
Bank of Cyprus Holdings PLC
2.2%
Vingroup JSC
1.6%
Nova Ljubljanska Banka DD, GDR
1.4%
National Bank of Greece SA
1.3%
Georgia Capital PLC
1.2%
NAC Kazatomprom JSC, GDR
1.2%
Total
27.5%
Footnote Description
Footnotea
Excluding cash equivalents
Material Fund Change [Text Block]
Updated Prospectus Phone Number 1-800-262-1122
[1] Annualized