| Form N-CSR Cover | 12 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | HIGH INCOME OPPORTUNITIES PORTFOLIO |
| Entity Central Index Key | 0000921370 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Oct. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | HIGH INCOME OPPORTUNITIES PORTFOLIO |
| Entity Central Index Key | 0000921370 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| C000014260 | |
| Shareholder Report [Line Items] | |
| Fund Name | High Income Opportunities Portfolio |
| No Trading Symbol [Flag] | true |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the High Income Opportunities Portfolio (the "Fund") for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B18"><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: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Fund Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment High Income Opportunities Portfolio $55 0.51% |
| Expenses Paid, Amount | $ 55 |
| Expense Ratio, Percent | 0.51% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the ICE BofA U.S. High Yield Index (the Index): ↓ The Fund’s selections by sector ― particularly selections in the health care, gaming, and retail sectors ― detracted from returns relative to the Index ↓ Allocations by credit quality ― especially a broad underweight exposure to distressed CCC-rated securities and lower ― hurt relative returns during the period ↓ Selections by credit quality ― particularly selections in B-rated and CCC-rated securities ― detracted from returns relative to the Index during the period ↓ The Fund’s security selections by duration ― especially selections in securities with durations of less than 5 years ― hurt relative returns during the period ↑ An overweight exposure to the health care sector and an underweight allocation to the energy sector aided returns relative to the Index during the period ↑ An underweight exposure and security selections in the BB-rated segment contributed to the Fund’s performance relative to the Index during the period ↑ The Fund’s selections in lower-rated securities contributed to performance relative to the Index during the period ↑ A slightly overweight exposure to securities with durations between 5-10 years contributed to returns relative to the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | High Income Opportunities Portfolio Bloomberg U.S. Universal Index ICE BofA U.S. High Yield Constrained Index ICE BofA U.S. High Yield Index 10/14 $10,000 $10,000 $10,000 $10,000 11/14 $9,921 $10,054 $9,929 $9,929 12/14 $9,822 $10,036 $9,783 $9,782 1/15 $9,917 $10,227 $9,850 $9,850 2/15 $10,138 $10,167 $10,085 $10,085 3/15 $10,103 $10,209 $10,032 $10,031 4/15 $10,220 $10,197 $10,152 $10,151 5/15 $10,273 $10,180 $10,182 $10,181 6/15 $10,169 $10,066 $10,027 $10,026 7/15 $10,178 $10,125 $9,966 $9,964 8/15 $10,052 $10,095 $9,789 $9,789 9/15 $9,788 $10,134 $9,538 $9,535 10/15 $10,070 $10,167 $9,797 $9,795 11/15 $9,914 $10,130 $9,579 $9,575 12/15 $9,736 $10,079 $9,332 $9,328 1/16 $9,673 $10,190 $9,184 $9,180 2/16 $9,768 $10,263 $9,227 $9,223 3/16 $10,053 $10,388 $9,635 $9,631 4/16 $10,291 $10,459 $10,020 $10,016 5/16 $10,344 $10,467 $10,092 $10,088 6/16 $10,396 $10,652 $10,202 $10,197 7/16 $10,592 $10,739 $10,459 $10,455 8/16 $10,785 $10,751 $10,692 $10,688 9/16 $10,834 $10,753 $10,761 $10,757 10/16 $10,837 $10,682 $10,795 $10,790 11/16 $10,814 $10,442 $10,752 $10,748 12/16 $10,987 $10,473 $10,964 $10,959 1/17 $11,112 $10,510 $11,111 $11,106 2/17 $11,257 $10,591 $11,284 $11,280 3/17 $11,235 $10,588 $11,260 $11,256 4/17 $11,361 $10,675 $11,388 $11,384 5/17 $11,463 $10,758 $11,489 $11,485 6/17 $11,489 $10,749 $11,501 $11,497 7/17 $11,593 $10,802 $11,634 $11,630 8/17 $11,570 $10,895 $11,631 $11,627 9/17 $11,673 $10,857 $11,736 $11,731 10/17 $11,701 $10,870 $11,781 $11,777 11/17 $11,677 $10,854 $11,750 $11,745 12/17 $11,706 $10,901 $11,784 $11,779 1/18 $11,760 $10,797 $11,860 $11,855 2/18 $11,680 $10,694 $11,749 $11,744 3/18 $11,631 $10,748 $11,677 $11,672 4/18 $11,685 $10,676 $11,754 $11,750 5/18 $11,661 $10,735 $11,753 $11,748 6/18 $11,689 $10,719 $11,793 $11,788 7/18 $11,825 $10,741 $11,925 $11,920 8/18 $11,881 $10,794 $12,011 $12,006 9/18 $11,936 $10,748 $12,081 $12,076 10/18 $11,751 $10,658 $11,883 $11,878 11/18 $11,644 $10,706 $11,775 $11,771 12/18 $11,348 $10,874 $11,517 $11,513 1/19 $11,870 $11,024 $12,046 $12,041 2/19 $12,033 $11,036 $12,249 $12,245 3/19 $12,146 $11,235 $12,370 $12,365 4/19 $12,286 $11,251 $12,543 $12,538 5/19 $12,150 $11,423 $12,383 $12,378 6/19 $12,431 $11,585 $12,687 $12,682 7/19 $12,491 $11,619 $12,752 $12,747 8/19 $12,522 $11,882 $12,802 $12,797 9/19 $12,609 $11,830 $12,842 $12,837 10/19 $12,641 $11,869 $12,872 $12,867 11/19 $12,728 $11,866 $12,907 $12,902 12/19 $12,990 $11,884 $13,177 $13,172 1/20 $12,936 $12,097 $13,177 $13,172 2/20 $12,732 $12,278 $12,973 $12,968 3/20 $11,158 $12,039 $11,446 $11,443 4/20 $11,688 $12,280 $11,882 $11,878 5/20 $12,164 $12,394 $12,421 $12,421 6/20 $12,224 $12,498 $12,539 $12,542 7/20 $12,765 $12,717 $13,134 $13,142 8/20 $12,888 $12,644 $13,265 $13,271 9/20 $12,769 $12,621 $13,127 $13,133 10/20 $12,833 $12,576 $13,187 $13,194 11/20 $13,351 $12,740 $13,715 $13,722 12/20 $13,599 $12,784 $13,977 $13,984 1/21 $13,664 $12,704 $14,031 $14,037 2/21 $13,785 $12,540 $14,079 $14,086 3/21 $13,814 $12,394 $14,104 $14,110 4/21 $13,967 $12,498 $14,259 $14,265 5/21 $14,028 $12,546 $14,300 $14,306 6/21 $14,245 $12,637 $14,495 $14,502 7/21 $14,275 $12,764 $14,545 $14,553 8/21 $14,337 $12,756 $14,626 $14,633 9/21 $14,493 $12,647 $14,632 $14,638 10/21 $14,492 $12,636 $14,604 $14,612 11/21 $14,328 $12,652 $14,453 $14,462 12/21 $14,617 $12,643 $14,724 $14,734 1/22 $14,195 $12,366 $14,321 $14,329 2/22 $14,350 $12,197 $14,193 $14,200 3/22 $14,251 $11,870 $14,063 $14,069 4/22 $13,822 $11,427 $13,552 $13,557 5/22 $13,820 $11,490 $13,584 $13,591 6/22 $12,990 $11,261 $12,659 $12,666 7/22 $13,720 $11,544 $13,421 $13,429 8/22 $13,485 $11,244 $13,100 $13,107 9/22 $12,979 $10,759 $12,574 $12,580 10/22 $13,281 $10,641 $12,932 $12,938 11/22 $13,650 $11,038 $13,172 $13,180 12/22 $13,581 $11,001 $13,074 $13,081 1/23 $14,092 $11,342 $13,585 $13,593 2/23 $13,878 $11,063 $13,411 $13,417 3/23 $14,119 $11,323 $13,560 $13,568 4/23 $14,185 $11,392 $13,692 $13,699 5/23 $14,050 $11,274 $13,561 $13,569 6/23 $14,265 $11,256 $13,782 $13,789 7/23 $14,444 $11,267 $13,979 $13,986 8/23 $14,450 $11,200 $14,020 $14,026 9/23 $14,315 $10,932 $13,856 $13,863 10/23 $14,141 $10,768 $13,683 $13,691 11/23 $14,688 $11,253 $14,307 $14,314 12/23 $15,204 $11,680 $14,835 $14,842 1/24 $15,246 $11,652 $14,838 $14,844 2/24 $15,253 $11,512 $14,882 $14,888 3/24 $15,484 $11,625 $15,059 $15,066 4/24 $15,344 $11,353 $14,909 $14,915 5/24 $15,540 $11,542 $15,078 $15,084 6/24 $15,701 $11,647 $15,223 $15,230 7/24 $15,899 $11,911 $15,522 $15,529 8/24 $16,137 $12,087 $15,769 $15,776 9/24 $16,299 $12,253 $16,027 $16,034 10/24 $16,233 $11,974 $15,939 $15,945 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years High Income Opportunities Portfolio 14.95% 5.12% 4.96% Bloomberg U.S. Universal Index Footnote Reference 11.20% 0.18% 1.82% ICE BofA U.S. High Yield Index 16.47% 4.38% 4.77% ICE BofA U.S. High Yield Constrained Index 16.49% 4.36% 4.77% |
| AssetsNet | $ 1,491,790,163 |
| Holdings Count | Holding | 482 |
| Advisory Fees Paid, Amount | $ 6,247,889 |
| InvestmentCompanyPortfolioTurnover | 43% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $1,491,790,163 # of Portfolio Holdings 482 Portfolio Turnover Rate 43% Total Advisory Fees Paid $6,247,889 |
| Holdings [Text Block] | Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 5.6% CCC or Lower 12.0% B 38.1% BB 40.2% BBB 4.1% Footnote Description Footnote a Excludes Short-Term Investments. Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). This breakdown assigns a numeric equivalent to the ratings from the aforementioned agencies and the mean is rounded to the nearest integer and converted to an equivalent S&P rating ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Oct. 31, 2024 | Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Jun. 30, 2024 | May 31, 2024 | Apr. 30, 2024 | Mar. 31, 2024 | Feb. 29, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Aug. 31, 2023 | Jul. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Oct. 31, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Aug. 31, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Aug. 31, 2020 | Jul. 31, 2020 | Jun. 30, 2020 | May 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2019 | Oct. 31, 2019 | Sep. 30, 2019 | Aug. 31, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | Aug. 31, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Feb. 29, 2016 | Jan. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2015 | Oct. 31, 2015 | Sep. 30, 2015 | Aug. 31, 2015 | Jul. 31, 2015 | Jun. 30, 2015 | May 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2015 | Jan. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2014 | Oct. 31, 2014 | |
| C000014260 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | High Income Opportunities Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 16,233 | $ 16,299 | $ 16,137 | $ 15,899 | $ 15,701 | $ 15,540 | $ 15,344 | $ 15,484 | $ 15,253 | $ 15,246 | $ 15,204 | $ 14,688 | $ 14,141 | $ 14,315 | $ 14,450 | $ 14,444 | $ 14,265 | $ 14,050 | $ 14,185 | $ 14,119 | $ 13,878 | $ 14,092 | $ 13,581 | $ 13,650 | $ 13,281 | $ 12,979 | $ 13,485 | $ 13,720 | $ 12,990 | $ 13,820 | $ 13,822 | $ 14,251 | $ 14,350 | $ 14,195 | $ 14,617 | $ 14,328 | $ 14,492 | $ 14,493 | $ 14,337 | $ 14,275 | $ 14,245 | $ 14,028 | $ 13,967 | $ 13,814 | $ 13,785 | $ 13,664 | $ 13,599 | $ 13,351 | $ 12,833 | $ 12,769 | $ 12,888 | $ 12,765 | $ 12,224 | $ 12,164 | $ 11,688 | $ 11,158 | $ 12,732 | $ 12,936 | $ 12,990 | $ 12,728 | $ 12,641 | $ 12,609 | $ 12,522 | $ 12,491 | $ 12,431 | $ 12,150 | $ 12,286 | $ 12,146 | $ 12,033 | $ 11,870 | $ 11,348 | $ 11,644 | $ 11,751 | $ 11,936 | $ 11,881 | $ 11,825 | $ 11,689 | $ 11,661 | $ 11,685 | $ 11,631 | $ 11,680 | $ 11,760 | $ 11,706 | $ 11,677 | $ 11,701 | $ 11,673 | $ 11,570 | $ 11,593 | $ 11,489 | $ 11,463 | $ 11,361 | $ 11,235 | $ 11,257 | $ 11,112 | $ 10,987 | $ 10,814 | $ 10,837 | $ 10,834 | $ 10,785 | $ 10,592 | $ 10,396 | $ 10,344 | $ 10,291 | $ 10,053 | $ 9,768 | $ 9,673 | $ 9,736 | $ 9,914 | $ 10,070 | $ 9,788 | $ 10,052 | $ 10,178 | $ 10,169 | $ 10,273 | $ 10,220 | $ 10,103 | $ 10,138 | $ 9,917 | $ 9,822 | $ 9,921 | $ 10,000 |
| EATON VANCE Index: Bloomberg U.S. Universal Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,974 | 12,253 | 12,087 | 11,911 | 11,647 | 11,542 | 11,353 | 11,625 | 11,512 | 11,652 | 11,680 | 11,253 | 10,768 | 10,932 | 11,200 | 11,267 | 11,256 | 11,274 | 11,392 | 11,323 | 11,063 | 11,342 | 11,001 | 11,038 | 10,641 | 10,759 | 11,244 | 11,544 | 11,261 | 11,490 | 11,427 | 11,870 | 12,197 | 12,366 | 12,643 | 12,652 | 12,636 | 12,647 | 12,756 | 12,764 | 12,637 | 12,546 | 12,498 | 12,394 | 12,540 | 12,704 | 12,784 | 12,740 | 12,576 | 12,621 | 12,644 | 12,717 | 12,498 | 12,394 | 12,280 | 12,039 | 12,278 | 12,097 | 11,884 | 11,866 | 11,869 | 11,830 | 11,882 | 11,619 | 11,585 | 11,423 | 11,251 | 11,235 | 11,036 | 11,024 | 10,874 | 10,706 | 10,658 | 10,748 | 10,794 | 10,741 | 10,719 | 10,735 | 10,676 | 10,748 | 10,694 | 10,797 | 10,901 | 10,854 | 10,870 | 10,857 | 10,895 | 10,802 | 10,749 | 10,758 | 10,675 | 10,588 | 10,591 | 10,510 | 10,473 | 10,442 | 10,682 | 10,753 | 10,751 | 10,739 | 10,652 | 10,467 | 10,459 | 10,388 | 10,263 | 10,190 | 10,079 | 10,130 | 10,167 | 10,134 | 10,095 | 10,125 | 10,066 | 10,180 | 10,197 | 10,209 | 10,167 | 10,227 | 10,036 | 10,054 | 10,000 |
| EATON VANCE Index: ICE BofA U.S. High Yield Constrained Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,939 | 16,027 | 15,769 | 15,522 | 15,223 | 15,078 | 14,909 | 15,059 | 14,882 | 14,838 | 14,835 | 14,307 | 13,683 | 13,856 | 14,020 | 13,979 | 13,782 | 13,561 | 13,692 | 13,560 | 13,411 | 13,585 | 13,074 | 13,172 | 12,932 | 12,574 | 13,100 | 13,421 | 12,659 | 13,584 | 13,552 | 14,063 | 14,193 | 14,321 | 14,724 | 14,453 | 14,604 | 14,632 | 14,626 | 14,545 | 14,495 | 14,300 | 14,259 | 14,104 | 14,079 | 14,031 | 13,977 | 13,715 | 13,187 | 13,127 | 13,265 | 13,134 | 12,539 | 12,421 | 11,882 | 11,446 | 12,973 | 13,177 | 13,177 | 12,907 | 12,872 | 12,842 | 12,802 | 12,752 | 12,687 | 12,383 | 12,543 | 12,370 | 12,249 | 12,046 | 11,517 | 11,775 | 11,883 | 12,081 | 12,011 | 11,925 | 11,793 | 11,753 | 11,754 | 11,677 | 11,749 | 11,860 | 11,784 | 11,750 | 11,781 | 11,736 | 11,631 | 11,634 | 11,501 | 11,489 | 11,388 | 11,260 | 11,284 | 11,111 | 10,964 | 10,752 | 10,795 | 10,761 | 10,692 | 10,459 | 10,202 | 10,092 | 10,020 | 9,635 | 9,227 | 9,184 | 9,332 | 9,579 | 9,797 | 9,538 | 9,789 | 9,966 | 10,027 | 10,182 | 10,152 | 10,032 | 10,085 | 9,850 | 9,783 | 9,929 | 10,000 |
| EATON VANCE Index: ICE BofA U.S. High Yield Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 15,945 | $ 16,034 | $ 15,776 | $ 15,529 | $ 15,230 | $ 15,084 | $ 14,915 | $ 15,066 | $ 14,888 | $ 14,844 | $ 14,842 | $ 14,314 | $ 13,691 | $ 13,863 | $ 14,026 | $ 13,986 | $ 13,789 | $ 13,569 | $ 13,699 | $ 13,568 | $ 13,417 | $ 13,593 | $ 13,081 | $ 13,180 | $ 12,938 | $ 12,580 | $ 13,107 | $ 13,429 | $ 12,666 | $ 13,591 | $ 13,557 | $ 14,069 | $ 14,200 | $ 14,329 | $ 14,734 | $ 14,462 | $ 14,612 | $ 14,638 | $ 14,633 | $ 14,553 | $ 14,502 | $ 14,306 | $ 14,265 | $ 14,110 | $ 14,086 | $ 14,037 | $ 13,984 | $ 13,722 | $ 13,194 | $ 13,133 | $ 13,271 | $ 13,142 | $ 12,542 | $ 12,421 | $ 11,878 | $ 11,443 | $ 12,968 | $ 13,172 | $ 13,172 | $ 12,902 | $ 12,867 | $ 12,837 | $ 12,797 | $ 12,747 | $ 12,682 | $ 12,378 | $ 12,538 | $ 12,365 | $ 12,245 | $ 12,041 | $ 11,513 | $ 11,771 | $ 11,878 | $ 12,076 | $ 12,006 | $ 11,920 | $ 11,788 | $ 11,748 | $ 11,750 | $ 11,672 | $ 11,744 | $ 11,855 | $ 11,779 | $ 11,745 | $ 11,777 | $ 11,731 | $ 11,627 | $ 11,630 | $ 11,497 | $ 11,485 | $ 11,384 | $ 11,256 | $ 11,280 | $ 11,106 | $ 10,959 | $ 10,748 | $ 10,790 | $ 10,757 | $ 10,688 | $ 10,455 | $ 10,197 | $ 10,088 | $ 10,016 | $ 9,631 | $ 9,223 | $ 9,180 | $ 9,328 | $ 9,575 | $ 9,795 | $ 9,535 | $ 9,789 | $ 9,964 | $ 10,026 | $ 10,181 | $ 10,151 | $ 10,031 | $ 10,085 | $ 9,850 | $ 9,782 | $ 9,929 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | |
| C000014260 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | High Income Opportunities Portfolio | ||
| Without Sales Load [Member] | C000014260 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 14.95% | 5.12% | 4.96% |
| EATON VANCE Index: Bloomberg U.S. Universal Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Index | ||
| Average Annual Return, Percent | 11.20% | 0.18% | 1.82% |
| EATON VANCE Index: ICE BofA U.S. High Yield Constrained Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Constrained Index | ||
| Average Annual Return, Percent | 16.49% | 4.36% | 4.77% |
| EATON VANCE Index: ICE BofA U.S. High Yield Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Index | ||
| Average Annual Return, Percent | 16.47% | 4.38% | 4.77% |
| Shareholder Report, Holdings (Details) - C000014260 | Oct. 31, 2024 |
| Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| CCC or Lower | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12% |
| B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.10% |
| BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.20% |
| BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Asset Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| AssetCommon Stocks | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| AssetExchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.20% |
| AssetAsset-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| AssetShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| AssetSenior Floating-Rate Loans | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| AssetCorporate Bonds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83% |
