| Form N-CSR Cover | 6 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | AB GLOBAL REAL ESTATE INVESTMENT FUND INC |
| Entity Central Index Key | 0001018368 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 6 Months Ended |
| May 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | AB GLOBAL REAL ESTATE INVESTMENT FUND INC |
| Entity Central Index Key | 0001018368 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| C000028092 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Global Real Estate Investment Fund |
| Class Name | Class A |
| Trading Symbol | AREAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the AB Global Real Estate Investment Fund (the "Fund") for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/AREAX-S |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/AREAX-S</span> " id="sjs-B19" xml:space="preserve"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">https://www.abfunds.com/link/AB/AREAX-S</span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $100 1.92% |
| Expenses Paid, Amount | $ 100 |
| Expense Ratio, Percent | 1.92% |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> " id="sjs-B23" xml:space="preserve"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: 18px; max-height: none; min-height: 0px;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> |
| Line Graph [Table Text Block] | Class A MSCI World Index FTSE EPRA/NAREIT Developed RE Index (net) FTSE NAREIT Equity REIT Index 05/14 $9,577 $10,000 $10,000 $10,000 11/14 $10,007 $10,225 $10,386 $10,916 11/15 $9,971 $10,151 $10,258 $11,141 11/16 $10,084 $10,471 $10,458 $11,635 11/17 $11,507 $12,948 $11,726 $12,689 11/18 $11,681 $12,965 $11,868 $12,949 11/19 $13,577 $14,849 $13,596 $14,880 11/20 $12,329 $17,005 $12,007 $13,020 11/21 $15,144 $20,709 $14,738 $17,498 11/22 $12,363 $18,460 $12,076 $15,033 11/23 $12,200 $20,857 $11,762 $14,568 05/24 $12,841 $23,963 $12,356 $15,447 |
| Average Annual Return [Table Text Block] | Class Name 6 Months 1 Year 5 Years 10 Years Class A (without sales charge) 5.26% 7.44% 0.51% 2.98% Class A (with sales charge) 0.75% 2.84% - 2.53% MSCI World Index 14.89% 24.92% 12.76% 9.13% FTSE EPRA/NAREIT Developed RE Index (net) 5.05% 7.31% -0.45% 2.14% FTSE NAREIT Equity REIT Index 6.04% 8.78% 2.38% 4.44% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. Visit https://www.abfunds.com/link/AB/AREAX-S |
| AssetsNet | $ 51,515,255 |
| Holdings Count | Holding | 99 |
| Advisory Fees Paid, Amount | $ 156,068 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $51,515,255 # of Portfolio Holdings 99 Portfolio Turnover Rate 31% Total Advisory Fees Paid $156,068 |
| Holdings [Text Block] | Industry Breakdown Value Value Industrial REITs 18.7% Retail REITs 14.2% Multi-Family Residential REITs 9.9% Data Center REITs 8.2% Real Estate Operating Companies 7.0% Health Care REITs 6.8% Office REITs 6.5% Diversified REITs 5.3% Self-Storage REITs 5.1% Diversified Real Estate Activities 4.8% Hotel & Resort REITs 3.1% Other Specialized REITs 2.8% Single-Family Residential REITs 2.7% Other 4.6% Short-Term Investments 1.1% Other Assets less Liabilities (0.8)% |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value Percentage of Net Assets Prologis, Inc. $3,632,580 7.0% Equinix, Inc. $2,630,755 5.1% Welltower, Inc. $2,242,382 4.3% Simon Property Group, Inc. $1,783,642 3.5% Digital Realty Trust, Inc. $1,611,820 3.1% UDR, Inc. $1,445,933 2.8% Independence Realty Trust, Inc. $1,335,332 2.6% Mid-America Apartment Communities, Inc. $1,284,953 2.5% Mitsui Fudosan Co., Ltd. $1,277,920 2.5% Public Storage $1,243,188 2.4% $18,488,505 35.8% |
| Material Fund Change [Text Block] | |
| C000028098 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Global Real Estate Investment Fund |
| Class Name | Class I |
| Trading Symbol | AEEIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the AB Global Real Estate Investment Fund (the "Fund") for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/AEEIX-S |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/AEEIX-S</span> " id="sjs-B44" xml:space="preserve"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">https://www.abfunds.com/link/AB/AEEIX-S</span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $78 1.51% |
| Expenses Paid, Amount | $ 78 |
| Expense Ratio, Percent | 1.51% |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> " id="sjs-B48" xml:space="preserve"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: 18px; max-height: none; min-height: 0px;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> |
| Line Graph [Table Text Block] | Class I MSCI World Index FTSE EPRA/NAREIT Developed RE Index (net) FTSE NAREIT Equity REIT Index 05/14 $10,000 $10,000 $10,000 $10,000 11/14 $10,465 $10,225 $10,386 $10,916 11/15 $10,469 $10,151 $10,258 $11,141 11/16 $10,624 $10,471 $10,458 $11,635 11/17 $12,159 $12,948 $11,726 $12,689 11/18 $12,385 $12,965 $11,868 $12,949 11/19 $14,445 $14,849 $13,596 $14,880 11/20 $13,169 $17,005 $12,007 $13,020 11/21 $16,233 $20,709 $14,738 $17,498 11/22 $13,305 $18,460 $12,076 $15,033 11/23 $13,181 $20,857 $11,762 $14,568 05/24 $13,901 $23,963 $12,356 $15,447 |
| Average Annual Return [Table Text Block] | Class Name 6 Months 1 Year 5 Years 10 Years Class I (without sales charge) 5.47% 7.92% 0.89% 3.35% Class I (with sales charge) 5.47% 7.92% 0.89% 3.35% MSCI World Index 14.89% 24.92% 12.76% 9.13% FTSE EPRA/NAREIT Developed RE Index (net) 5.05% 7.31% -0.45% 2.14% FTSE NAREIT Equity REIT Index 6.04% 8.78% 2.38% 4.44% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. Visit https://www.abfunds.com/link/AB/AEEIX-S |
| AssetsNet | $ 51,515,255 |
| Holdings Count | Holding | 99 |
| Advisory Fees Paid, Amount | $ 156,068 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $51,515,255 # of Portfolio Holdings 99 Portfolio Turnover Rate 31% Total Advisory Fees Paid $156,068 |
| Holdings [Text Block] | Industry Breakdown Value Value Industrial REITs 18.7% Retail REITs 14.2% Multi-Family Residential REITs 9.9% Data Center REITs 8.2% Real Estate Operating Companies 7.0% Health Care REITs 6.8% Office REITs 6.5% Diversified REITs 5.3% Self-Storage REITs 5.1% Diversified Real Estate Activities 4.8% Hotel & Resort REITs 3.1% Other Specialized REITs 2.8% Single-Family Residential REITs 2.7% Other 4.6% Short-Term Investments 1.1% Other Assets less Liabilities (0.8)% |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value Percentage of Net Assets Prologis, Inc. $3,632,580 7.0% Equinix, Inc. $2,630,755 5.1% Welltower, Inc. $2,242,382 4.3% Simon Property Group, Inc. $1,783,642 3.5% Digital Realty Trust, Inc. $1,611,820 3.1% UDR, Inc. $1,445,933 2.8% Independence Realty Trust, Inc. $1,335,332 2.6% Mid-America Apartment Communities, Inc. $1,284,953 2.5% Mitsui Fudosan Co., Ltd. $1,277,920 2.5% Public Storage $1,243,188 2.4% $18,488,505 35.8% |
| Material Fund Change [Text Block] | |
| C000028097 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Global Real Estate Investment Fund |
| Class Name | Class K |
| Trading Symbol | ARRKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the AB Global Real Estate Investment Fund (the "Fund") for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/ARRKX-S |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/ARRKX-S</span> " id="sjs-B69" xml:space="preserve"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">https://www.abfunds.com/link/AB/ARRKX-S</span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class K $99 1.90% |
| Expenses Paid, Amount | $ 99 |
| Expense Ratio, Percent | 1.90% |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> " id="sjs-B73" xml:space="preserve"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: 18px; max-height: none; min-height: 0px;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> |
| Line Graph [Table Text Block] | Class K MSCI World Index FTSE EPRA/NAREIT Developed RE Index (net) FTSE NAREIT Equity REIT Index 05/14 $10,000 $10,000 $10,000 $10,000 11/14 $10,445 $10,225 $10,386 $10,916 11/15 $10,411 $10,151 $10,258 $11,141 11/16 $10,529 $10,471 $10,458 $11,635 11/17 $12,015 $12,948 $11,726 $12,689 11/18 $12,195 $12,965 $11,868 $12,949 11/19 $14,162 $14,849 $13,596 $14,880 11/20 $12,864 $17,005 $12,007 $13,020 11/21 $15,804 $20,709 $14,738 $17,498 11/22 $12,897 $18,460 $12,076 $15,033 11/23 $12,718 $20,857 $11,762 $14,568 05/24 $13,400 $23,963 $12,356 $15,447 |
| Average Annual Return [Table Text Block] | Class Name 6 Months 1 Year 5 Years 10 Years Class K (without sales charge) 5.36% 7.52% 0.51% 2.97% Class K (with sales charge) 5.36% 7.52% 0.51% 2.97% MSCI World Index 14.89% 24.92% 12.76% 9.13% FTSE EPRA/NAREIT Developed RE Index (net) 5.05% 7.31% -0.45% 2.14% FTSE NAREIT Equity REIT Index 6.04% 8.78% 2.38% 4.44% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. Visit https://www.abfunds.com/link/AB/ARRKX-S |
| AssetsNet | $ 51,515,255 |
| Holdings Count | Holding | 99 |
| Advisory Fees Paid, Amount | $ 156,068 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $51,515,255 # of Portfolio Holdings 99 Portfolio Turnover Rate 31% Total Advisory Fees Paid $156,068 |
| Holdings [Text Block] | Industry Breakdown Value Value Industrial REITs 18.7% Retail REITs 14.2% Multi-Family Residential REITs 9.9% Data Center REITs 8.2% Real Estate Operating Companies 7.0% Health Care REITs 6.8% Office REITs 6.5% Diversified REITs 5.3% Self-Storage REITs 5.1% Diversified Real Estate Activities 4.8% Hotel & Resort REITs 3.1% Other Specialized REITs 2.8% Single-Family Residential REITs 2.7% Other 4.6% Short-Term Investments 1.1% Other Assets less Liabilities (0.8)% |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value Percentage of Net Assets Prologis, Inc. $3,632,580 7.0% Equinix, Inc. $2,630,755 5.1% Welltower, Inc. $2,242,382 4.3% Simon Property Group, Inc. $1,783,642 3.5% Digital Realty Trust, Inc. $1,611,820 3.1% UDR, Inc. $1,445,933 2.8% Independence Realty Trust, Inc. $1,335,332 2.6% Mid-America Apartment Communities, Inc. $1,284,953 2.5% Mitsui Fudosan Co., Ltd. $1,277,920 2.5% Public Storage $1,243,188 2.4% $18,488,505 35.8% |
| Material Fund Change [Text Block] | |
| C000028095 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Global Real Estate Investment Fund |
| Class Name | Advisor Class |
| Trading Symbol | ARSYX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the AB Global Real Estate Investment Fund (the "Fund") for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/ARSYX-S |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/ARSYX-S</span> " id="sjs-B94" xml:space="preserve"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">https://www.abfunds.com/link/AB/ARSYX-S</span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $87 1.67% |
| Expenses Paid, Amount | $ 87 |
| Expense Ratio, Percent | 1.67% |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> " id="sjs-B98" xml:space="preserve"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: 18px; max-height: none; min-height: 0px;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> |
| Line Graph [Table Text Block] | Advisor Class MSCI World Index FTSE EPRA/NAREIT Developed RE Index (net) FTSE NAREIT Equity REIT Index 05/14 $10,000 $10,000 $10,000 $10,000 11/14 $10,459 $10,225 $10,386 $10,916 11/15 $10,452 $10,151 $10,258 $11,141 11/16 $10,600 $10,471 $10,458 $11,635 11/17 $12,122 $12,948 $11,726 $12,689 11/18 $12,339 $12,965 $11,868 $12,949 11/19 $14,370 $14,849 $13,596 $14,880 11/20 $13,086 $17,005 $12,007 $13,020 11/21 $16,112 $20,709 $14,738 $17,498 11/22 $13,191 $18,460 $12,076 $15,033 11/23 $13,049 $20,857 $11,762 $14,568 05/24 $13,751 $23,963 $12,356 $15,447 |
| Average Annual Return [Table Text Block] | Class Name 6 Months 1 Year 5 Years 10 Years Advisor Class (without sales charge) 5.38% 7.72% 0.77% 3.24% Advisor Class (with sales charge) 5.38% 7.72% 0.77% 3.24% MSCI World Index 14.89% 24.92% 12.76% 9.13% FTSE EPRA/NAREIT Developed RE Index (net) 5.05% 7.31% -0.45% 2.14% FTSE NAREIT Equity REIT Index 6.04% 8.78% 2.38% 4.44% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. Visit https://www.abfunds.com/link/AB/ARSYX-S |
| AssetsNet | $ 51,515,255 |
| Holdings Count | Holding | 99 |
| Advisory Fees Paid, Amount | $ 156,068 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $51,515,255 # of Portfolio Holdings 99 Portfolio Turnover Rate 31% Total Advisory Fees Paid $156,068 |
| Holdings [Text Block] | Industry Breakdown Value Value Industrial REITs 18.7% Retail REITs 14.2% Multi-Family Residential REITs 9.9% Data Center REITs 8.2% Real Estate Operating Companies 7.0% Health Care REITs 6.8% Office REITs 6.5% Diversified REITs 5.3% Self-Storage REITs 5.1% Diversified Real Estate Activities 4.8% Hotel & Resort REITs 3.1% Other Specialized REITs 2.8% Single-Family Residential REITs 2.7% Other 4.6% Short-Term Investments 1.1% Other Assets less Liabilities (0.8)% |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value Percentage of Net Assets Prologis, Inc. $3,632,580 7.0% Equinix, Inc. $2,630,755 5.1% Welltower, Inc. $2,242,382 4.3% Simon Property Group, Inc. $1,783,642 3.5% Digital Realty Trust, Inc. $1,611,820 3.1% UDR, Inc. $1,445,933 2.8% Independence Realty Trust, Inc. $1,335,332 2.6% Mid-America Apartment Communities, Inc. $1,284,953 2.5% Mitsui Fudosan Co., Ltd. $1,277,920 2.5% Public Storage $1,243,188 2.4% $18,488,505 35.8% |
| Material Fund Change [Text Block] | |
| C000028094 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Global Real Estate Investment Fund |
| Class Name | Class C |
| Trading Symbol | ARECX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the AB Global Real Estate Investment Fund (the "Fund") for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/ARECX-S |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/ARECX-S</span> " id="sjs-B119" xml:space="preserve"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">https://www.abfunds.com/link/AB/ARECX-S</span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $139 2.68% |
| Expenses Paid, Amount | $ 139 |
| Expense Ratio, Percent | 2.68% |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> " id="sjs-B123" xml:space="preserve"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: 18px; max-height: none; min-height: 0px;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> |
| Line Graph [Table Text Block] | Class C MSCI World Index FTSE EPRA/NAREIT Developed RE Index (net) FTSE NAREIT Equity REIT Index 05/14 $10,000 $10,000 $10,000 $10,000 11/14 $10,412 $10,225 $10,386 $10,916 11/15 $10,303 $10,151 $10,258 $11,141 11/16 $10,342 $10,471 $10,458 $11,635 11/17 $11,709 $12,948 $11,726 $12,689 11/18 $11,794 $12,965 $11,868 $12,949 11/19 $13,605 $14,849 $13,596 $14,880 11/20 $12,263 $17,005 $12,007 $13,020 11/21 $14,951 $20,709 $14,738 $17,498 11/22 $12,114 $18,460 $12,076 $15,033 11/23 $11,862 $20,857 $11,762 $14,568 05/24 $12,442 $23,963 $12,356 $15,447 |
| Average Annual Return [Table Text Block] | Class Name 6 Months 1 Year 5 Years 10 Years Class C (without sales charge) 4.89% 6.70% - 2.21% Class C (with sales charge) 3.89% 5.70% - 2.21% MSCI World Index 14.89% 24.92% 12.76% 9.13% FTSE EPRA/NAREIT Developed RE Index (net) 5.05% 7.31% -0.45% 2.14% FTSE NAREIT Equity REIT Index 6.04% 8.78% 2.38% 4.44% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. Visit https://www.abfunds.com/link/AB/ARECX-S |
| AssetsNet | $ 51,515,255 |
| Holdings Count | Holding | 99 |
| Advisory Fees Paid, Amount | $ 156,068 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $51,515,255 # of Portfolio Holdings 99 Portfolio Turnover Rate 31% Total Advisory Fees Paid $156,068 |
| Holdings [Text Block] | Industry Breakdown Value Value Industrial REITs 18.7% Retail REITs 14.2% Multi-Family Residential REITs 9.9% Data Center REITs 8.2% Real Estate Operating Companies 7.0% Health Care REITs 6.8% Office REITs 6.5% Diversified REITs 5.3% Self-Storage REITs 5.1% Diversified Real Estate Activities 4.8% Hotel & Resort REITs 3.1% Other Specialized REITs 2.8% Single-Family Residential REITs 2.7% Other 4.6% Short-Term Investments 1.1% Other Assets less Liabilities (0.8)% |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value Percentage of Net Assets Prologis, Inc. $3,632,580 7.0% Equinix, Inc. $2,630,755 5.1% Welltower, Inc. $2,242,382 4.3% Simon Property Group, Inc. $1,783,642 3.5% Digital Realty Trust, Inc. $1,611,820 3.1% UDR, Inc. $1,445,933 2.8% Independence Realty Trust, Inc. $1,335,332 2.6% Mid-America Apartment Communities, Inc. $1,284,953 2.5% Mitsui Fudosan Co., Ltd. $1,277,920 2.5% Public Storage $1,243,188 2.4% $18,488,505 35.8% |
| Material Fund Change [Text Block] | |
| C000028096 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Global Real Estate Investment Fund |
| Class Name | Class R |
| Trading Symbol | ARRRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the AB Global Real Estate Investment Fund (the "Fund") for the period of December 1, 2023 to May 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/ARRRX-S |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/ARRRX-S</span> " id="sjs-B144" xml:space="preserve"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">https://www.abfunds.com/link/AB/ARRRX-S</span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R $115 2.22% |
| Expenses Paid, Amount | $ 115 |
| Expense Ratio, Percent | 2.22% |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> " id="sjs-B148" xml:space="preserve"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: 18px; max-height: none; min-height: 0px;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> </p> |
| Line Graph [Table Text Block] | Class R MSCI World Index FTSE EPRA/NAREIT Developed RE Index (net) FTSE NAREIT Equity REIT Index 05/14 $10,000 $10,000 $10,000 $10,000 11/14 $10,433 $10,225 $10,386 $10,916 11/15 $10,370 $10,151 $10,258 $11,141 11/16 $10,449 $10,471 $10,458 $11,635 11/17 $11,890 $12,948 $11,726 $12,689 11/18 $12,032 $12,965 $11,868 $12,949 11/19 $13,941 $14,849 $13,596 $14,880 11/20 $12,620 $17,005 $12,007 $13,020 11/21 $15,452 $20,709 $14,738 $17,498 11/22 $12,567 $18,460 $12,076 $15,033 11/23 $12,365 $20,857 $11,762 $14,568 05/24 $12,998 $23,963 $12,356 $15,447 |
| Average Annual Return [Table Text Block] | Class Name 6 Months 1 Year 5 Years 10 Years Class R (without sales charge) 5.12% 7.14% 0.19% 2.66% Class R (with sales charge) 5.12% 7.14% 0.19% 2.66% MSCI World Index 14.89% 24.92% 12.76% 9.13% FTSE EPRA/NAREIT Developed RE Index (net) 5.05% 7.31% -0.45% 2.14% FTSE NAREIT Equity REIT Index 6.04% 8.78% 2.38% 4.44% |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. Visit https://www.abfunds.com/link/AB/ARRRX-S |
| AssetsNet | $ 51,515,255 |
| Holdings Count | Holding | 99 |
| Advisory Fees Paid, Amount | $ 156,068 |
| InvestmentCompanyPortfolioTurnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $51,515,255 # of Portfolio Holdings 99 Portfolio Turnover Rate 31% Total Advisory Fees Paid $156,068 |
| Holdings [Text Block] | Industry Breakdown Value Value Industrial REITs 18.7% Retail REITs 14.2% Multi-Family Residential REITs 9.9% Data Center REITs 8.2% Real Estate Operating Companies 7.0% Health Care REITs 6.8% Office REITs 6.5% Diversified REITs 5.3% Self-Storage REITs 5.1% Diversified Real Estate Activities 4.8% Hotel & Resort REITs 3.1% Other Specialized REITs 2.8% Single-Family Residential REITs 2.7% Other 4.6% Short-Term Investments 1.1% Other Assets less Liabilities (0.8)% |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value Percentage of Net Assets Prologis, Inc. $3,632,580 7.0% Equinix, Inc. $2,630,755 5.1% Welltower, Inc. $2,242,382 4.3% Simon Property Group, Inc. $1,783,642 3.5% Digital Realty Trust, Inc. $1,611,820 3.1% UDR, Inc. $1,445,933 2.8% Independence Realty Trust, Inc. $1,335,332 2.6% Mid-America Apartment Communities, Inc. $1,284,953 2.5% Mitsui Fudosan Co., Ltd. $1,277,920 2.5% Public Storage $1,243,188 2.4% $18,488,505 35.8% |
| Material Fund Change [Text Block] |
| Shareholder Report, Line Graph (Details) - USD ($) | 6 Months Ended | 12 Months Ended | 60 Months Ended | 120 Months Ended | |||||||||||
| May 31, 2024 | May 31, 2024 | May 31, 2024 | May 31, 2024 | Nov. 30, 2023 | Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2014 | May 31, 2014 | |
| C000028092 | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,841 | $ 12,841 | $ 12,841 | $ 12,841 | $ 12,200 | $ 12,363 | $ 15,144 | $ 12,329 | $ 13,577 | $ 11,681 | $ 11,507 | $ 10,084 | $ 9,971 | $ 10,007 | $ 9,577 |
| Average Annual Return, Percent | 0.75% | 2.84% | (0.37%) | 2.53% | |||||||||||
| C000028092 | Without Sales Load [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.26% | 7.44% | 0.51% | 2.98% | |||||||||||
| C000028098 | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 13,901 | $ 13,901 | $ 13,901 | $ 13,901 | 13,181 | 13,305 | 16,233 | 13,169 | 14,445 | 12,385 | 12,159 | 10,624 | 10,469 | 10,465 | 10,000 |
| Average Annual Return, Percent | 5.47% | 7.92% | 0.89% | 3.35% | |||||||||||
| C000028098 | Without Sales Load [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.47% | 7.92% | 0.89% | 3.35% | |||||||||||
| C000028097 | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 13,400 | $ 13,400 | $ 13,400 | $ 13,400 | 12,718 | 12,897 | 15,804 | 12,864 | 14,162 | 12,195 | 12,015 | 10,529 | 10,411 | 10,445 | 10,000 |
| Average Annual Return, Percent | 5.36% | 7.52% | 0.51% | 2.97% | |||||||||||
| C000028097 | Without Sales Load [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.36% | 7.52% | 0.51% | 2.97% | |||||||||||
| C000028095 | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 13,751 | $ 13,751 | $ 13,751 | $ 13,751 | 13,049 | 13,191 | 16,112 | 13,086 | 14,370 | 12,339 | 12,122 | 10,600 | 10,452 | 10,459 | 10,000 |
| Average Annual Return, Percent | 5.38% | 7.72% | 0.77% | 3.24% | |||||||||||
| C000028095 | Without Sales Load [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.38% | 7.72% | 0.77% | 3.24% | |||||||||||
| C000028094 | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,442 | $ 12,442 | $ 12,442 | $ 12,442 | 11,862 | 12,114 | 14,951 | 12,263 | 13,605 | 11,794 | 11,709 | 10,342 | 10,303 | 10,412 | 10,000 |
| Average Annual Return, Percent | 3.89% | 5.70% | (0.24%) | 2.21% | |||||||||||
| C000028094 | Without Sales Load [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.89% | 6.70% | (0.24%) | 2.21% | |||||||||||
| C000028096 | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,998 | $ 12,998 | $ 12,998 | $ 12,998 | 12,365 | 12,567 | 15,452 | 12,620 | 13,941 | 12,032 | 11,890 | 10,449 | 10,370 | 10,433 | 10,000 |
| Average Annual Return, Percent | 5.12% | 7.14% | 0.19% | 2.66% | |||||||||||
| C000028096 | Without Sales Load [Member] | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.12% | 7.14% | 0.19% | 2.66% | |||||||||||
| MSCI World Index | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 23,963 | $ 23,963 | $ 23,963 | $ 23,963 | $ 20,857 | $ 18,460 | $ 20,709 | $ 17,005 | $ 14,849 | $ 12,965 | $ 12,948 | $ 10,471 | $ 10,151 | $ 10,225 | $ 10,000 |
| Average Annual Return, Percent | 14.89% | 24.92% | 12.76% | 9.13% |
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| C000028092 | 34501302Prologis Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028092 | 34501274Equinix Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028092 | 34501318Welltower Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028092 | 34501308Simon Property Group Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000028092 | 34501272Digital Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028092 | 34501313UDR Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028092 | 34501280Independence Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000028092 | 34501294Mid-America Apartment Communities Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028092 | 34501329Mitsui Fudosan Co., Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028092 | 34501303Public Storage | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000028092 | Other Assets and Liabilities Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028092 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028092 | Short-Term Investments Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028092 | USD | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000028092 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028092 | Industrial REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000028092 | Retail REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000028092 | Multi-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000028092 | Data Center REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000028092 | Real Estate Operating Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028092 | Health Care REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028092 | Office REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000028092 | Diversified REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028092 | Self-Storage REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028092 | Diversified Real Estate Activities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000028092 | Hotel & Resort REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028092 | Other Specialized REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028092 | Single-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028092 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028092 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.90% |
| C000028092 | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000028092 | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000028092 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000028092 | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028092 | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028092 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028092 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028092 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028092 | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028092 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028092 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028092 | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028098 | 34501302Prologis Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028098 | 34501274Equinix Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028098 | 34501318Welltower Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028098 | 34501308Simon Property Group Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000028098 | 34501272Digital Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028098 | 34501313UDR Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028098 | 34501280Independence Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000028098 | 34501294Mid-America Apartment Communities Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028098 | 34501329Mitsui Fudosan Co., Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028098 | 34501303Public Storage | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000028098 | Other Assets and Liabilities Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028098 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028098 | Short-Term Investments Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028098 | USD | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000028098 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028098 | Industrial REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000028098 | Retail REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000028098 | Multi-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000028098 | Data Center REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000028098 | Real Estate Operating Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028098 | Health Care REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028098 | Office REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000028098 | Diversified REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028098 | Self-Storage REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028098 | Diversified Real Estate Activities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000028098 | Hotel & Resort REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028098 | Other Specialized REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028098 | Single-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028098 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028098 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.90% |
| C000028098 | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000028098 | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000028098 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000028098 | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028098 | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028098 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028098 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028098 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028098 | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028098 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028098 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028098 | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028097 | 34501302Prologis Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028097 | 34501274Equinix Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028097 | 34501318Welltower Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028097 | 34501308Simon Property Group Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000028097 | 34501272Digital Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028097 | 34501313UDR Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028097 | 34501280Independence Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000028097 | 34501294Mid-America Apartment Communities Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028097 | 34501329Mitsui Fudosan Co., Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028097 | 34501303Public Storage | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000028097 | Other Assets and Liabilities Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028097 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028097 | Short-Term Investments Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028097 | USD | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000028097 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028097 | Industrial REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000028097 | Retail REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000028097 | Multi-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000028097 | Data Center REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000028097 | Real Estate Operating Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028097 | Health Care REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028097 | Office REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000028097 | Diversified REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028097 | Self-Storage REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028097 | Diversified Real Estate Activities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000028097 | Hotel & Resort REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028097 | Other Specialized REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028097 | Single-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028097 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028097 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.90% |
| C000028097 | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000028097 | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000028097 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000028097 | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028097 | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028097 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028097 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028097 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028097 | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028097 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028097 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028097 | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028095 | 34501302Prologis Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028095 | 34501274Equinix Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028095 | 34501318Welltower Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028095 | 34501308Simon Property Group Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000028095 | 34501272Digital Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028095 | 34501313UDR Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028095 | 34501280Independence Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000028095 | 34501294Mid-America Apartment Communities Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028095 | 34501329Mitsui Fudosan Co., Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028095 | 34501303Public Storage | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000028095 | Other Assets and Liabilities Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028095 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028095 | Short-Term Investments Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028095 | USD | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000028095 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028095 | Industrial REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000028095 | Retail REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000028095 | Multi-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000028095 | Data Center REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000028095 | Real Estate Operating Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028095 | Health Care REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028095 | Office REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000028095 | Diversified REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028095 | Self-Storage REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028095 | Diversified Real Estate Activities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000028095 | Hotel & Resort REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028095 | Other Specialized REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028095 | Single-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028095 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028095 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.90% |
| C000028095 | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000028095 | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000028095 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000028095 | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028095 | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028095 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028095 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028095 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028095 | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028095 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028095 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028095 | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028094 | 34501302Prologis Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028094 | 34501274Equinix Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028094 | 34501318Welltower Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028094 | 34501308Simon Property Group Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000028094 | 34501272Digital Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028094 | 34501313UDR Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028094 | 34501280Independence Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000028094 | 34501294Mid-America Apartment Communities Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028094 | 34501329Mitsui Fudosan Co., Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028094 | 34501303Public Storage | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000028094 | Other Assets and Liabilities Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028094 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028094 | Short-Term Investments Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028094 | USD | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000028094 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028094 | Industrial REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000028094 | Retail REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000028094 | Multi-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000028094 | Data Center REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000028094 | Real Estate Operating Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028094 | Health Care REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028094 | Office REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000028094 | Diversified REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028094 | Self-Storage REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028094 | Diversified Real Estate Activities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000028094 | Hotel & Resort REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028094 | Other Specialized REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028094 | Single-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028094 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028094 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.90% |
| C000028094 | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000028094 | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000028094 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000028094 | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028094 | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028094 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028094 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028094 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028094 | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028094 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028094 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028094 | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028096 | 34501302Prologis Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028096 | 34501274Equinix Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028096 | 34501318Welltower Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028096 | 34501308Simon Property Group Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000028096 | 34501272Digital Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028096 | 34501313UDR Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028096 | 34501280Independence Realty Trust Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000028096 | 34501294Mid-America Apartment Communities Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028096 | 34501329Mitsui Fudosan Co., Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028096 | 34501303Public Storage | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000028096 | Other Assets and Liabilities Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028096 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.80%) |
| C000028096 | Short-Term Investments Industry Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028096 | USD | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000028096 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000028096 | Industrial REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000028096 | Retail REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000028096 | Multi-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000028096 | Data Center REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000028096 | Real Estate Operating Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000028096 | Health Care REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028096 | Office REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000028096 | Diversified REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028096 | Self-Storage REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000028096 | Diversified Real Estate Activities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000028096 | Hotel & Resort REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028096 | Other Specialized REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028096 | Single-Family Residential REITs | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028096 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028096 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.90% |
| C000028096 | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| C000028096 | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000028096 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000028096 | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000028096 | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028096 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000028096 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028096 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028096 | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028096 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028096 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028096 | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
