Shareholder Report |
12 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Aug. 31, 2026
USD ($)
Holding
| |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Document Type | N-CSR | ||||||||||||||||||
| Amendment Flag | false | ||||||||||||||||||
| Registrant Name | American Funds U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Entity Central Index Key | 0002026099 | ||||||||||||||||||
| Entity Investment Company Type | N-1A | ||||||||||||||||||
| Document Period End Date | Aug. 31, 2026 | ||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class A | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class A | ||||||||||||||||||
| Trading Symbol | SMDEX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-A. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-A | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 78 | ||||||||||||||||||
| Expense Ratio, Percent | 0.73% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class A shares gained 13.86% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-A. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class A shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class C | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class C | ||||||||||||||||||
| Trading Symbol | SMDGX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-C. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-C | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 77 | ||||||||||||||||||
| Expense Ratio, Percent | 0.72% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class C shares gained 13.85% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-C. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class C shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class F-1 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class F-1 | ||||||||||||||||||
| Trading Symbol | SMDJX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-F1. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-F1 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 78 | ||||||||||||||||||
| Expense Ratio, Percent | 0.73% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class F-1 shares gained 13.88% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-F1. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class F-1 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class F-2 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class F-2 | ||||||||||||||||||
| Trading Symbol | SMDKX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-F2. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-F2 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 78 | ||||||||||||||||||
| Expense Ratio, Percent | 0.73% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class F-2 shares gained 13.85% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-F2. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class F-2 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class F-3 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class F-3 | ||||||||||||||||||
| Trading Symbol | SMDNX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-F3. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-F3 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 55 | ||||||||||||||||||
| Expense Ratio, Percent | 0.51% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class F-3 shares gained 14.12% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-F3. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class F-3 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class 529-A | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class 529-A | ||||||||||||||||||
| Trading Symbol | CMDDX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-529A. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-529A | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 84 | ||||||||||||||||||
| Expense Ratio, Percent | 0.79% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-A shares gained 13.70% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-529A. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class 529-A shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class 529-C | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class 529-C | ||||||||||||||||||
| Trading Symbol | CMDHX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-529C. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-529C | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 84 | ||||||||||||||||||
| Expense Ratio, Percent | 0.79% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-C shares gained 13.70% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-529C. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class 529-C shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class 529-E | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class 529-E | ||||||||||||||||||
| Trading Symbol | CMDJX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-529E. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-529E | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 84 | ||||||||||||||||||
| Expense Ratio, Percent | 0.79% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-E shares gained 13.70% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-529E. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class 529-E shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class 529-F-2 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class 529-F-2 | ||||||||||||||||||
| Trading Symbol | CMDNX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-529F2. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-529F2 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 90 | ||||||||||||||||||
| Expense Ratio, Percent | 0.84% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-F-2 shares gained 13.68% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-529F2. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class 529-F-2 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class 529-F-3 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class 529-F-3 | ||||||||||||||||||
| Trading Symbol | CMDOX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-529F3. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-529F3 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 61 | ||||||||||||||||||
| Expense Ratio, Percent | 0.57% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class 529-F-3 shares gained 13.97% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-529F3. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class 529-F-3 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-1 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-1 | ||||||||||||||||||
| Trading Symbol | RMDDX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 56 | ||||||||||||||||||
| Expense Ratio, Percent | 0.52% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-1 shares gained 14.10% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-1 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-2 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-2 | ||||||||||||||||||
| Trading Symbol | RMDEX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-R2. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-R2 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 55 | ||||||||||||||||||
| Expense Ratio, Percent | 0.51% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-2 shares gained 14.13% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-R2. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-2 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-2E | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-2E | ||||||||||||||||||
| Trading Symbol | RMDGX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-R2E. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-R2E | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 55 | ||||||||||||||||||
| Expense Ratio, Percent | 0.51% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-2E shares gained 14.13% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-R2E. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-2E shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-3 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-3 | ||||||||||||||||||
| Trading Symbol | RMDHX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-R3. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-R3 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 56 | ||||||||||||||||||
| Expense Ratio, Percent | 0.52% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-3 shares gained 14.12% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-R3. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-3 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-4 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-4 | ||||||||||||||||||
| Trading Symbol | RMDJX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-R4. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-R4 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 56 | ||||||||||||||||||
| Expense Ratio, Percent | 0.52% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-4 shares gained 14.11% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-R4. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-4 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-5E | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-5E | ||||||||||||||||||
| Trading Symbol | RMDKX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-R5E. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-R5E | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 56 | ||||||||||||||||||
| Expense Ratio, Percent | 0.52% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-5E shares gained 14.12% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-R5E. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-5E shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-5 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-5 | ||||||||||||||||||
| Trading Symbol | RMDLX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-R5. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-R5 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 56 | ||||||||||||||||||
| Expense Ratio, Percent | 0.52% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-5 shares gained 14.11% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-R5. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-5 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|
||||||||||||||||||
| American Funds® U.S. Small and Mid Cap Equity Fund - Class R-6 | |||||||||||||||||||
| Shareholder Report [Line Items] | |||||||||||||||||||
| Fund Name | American Funds® U.S. Small and Mid Cap Equity Fund | ||||||||||||||||||
| Class Name | Class R-6 | ||||||||||||||||||
| Trading Symbol | RMDMX | ||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about American Funds U.S. Small and Mid Cap Equity Fund (the "fund") for the period from September 1, 2025 to August 31, 2026. | ||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | ||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the fund at capitalgroup.com/SMID-R6. You can also request this information by contacting us at (800) 421-4225. | ||||||||||||||||||
| Additional Information Phone Number | (800) 421-4225 | ||||||||||||||||||
| Additional Information Website | capitalgroup.com/SMID-R6 | ||||||||||||||||||
| Expenses [Text Block] | What were the fund costs for the last year? (based on a hypothetical $10,000 investment)
|
||||||||||||||||||
| Expenses Paid, Amount | $ 55 | ||||||||||||||||||
| Expense Ratio, Percent | 0.51% | ||||||||||||||||||
| Factors Affecting Performance [Text Block] | Management's discussion of fund performance The fund’s Class R-6 shares gained 14.14% for the year ended August 31, 2026. That result compares with a 25.54% gain for the Russell 2500 Index. For information on returns for additional periods, including the fund lifetime, please refer to capitalgroup.com/SMID-R6. What factors influenced results U.S. equities delivered solid returns during the fiscal year, with small and mid-cap stocks outpacing large-cap equities, helped by a stable U.S. economy, attractive valuations relative to large caps and an overall higher risk appetite among investors. The U.S. economy continued to demonstrate resilience, boosted by healthy consumer spending. Amid signs of a softening labor market, the U.S. Federal Reserve implemented three 25-basis-point rate cuts in late 2025. Holdings across Conversely, the fund’s holdings in communication services and utilities detracted from returns. Consumer discretionary, materials and financials also lagged.
|
||||||||||||||||||
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a predictor of its future performance. | ||||||||||||||||||
| Line Graph [Table Text Block] |
|
||||||||||||||||||
| Average Annual Return [Table Text Block] | Average annual total returns
1 Class R-6 shares were first offered on September 27, 2024.2 Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.3 Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): London Stock Exchange Group. |
||||||||||||||||||
| Performance Inception Date | Sep. 27, 2024 | ||||||||||||||||||
| No Deduction of Taxes [Text Block] | The line chart and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | ||||||||||||||||||
| Net Assets | $ 1,025,000,000 | ||||||||||||||||||
| Holdings Count | Holding | 175 | ||||||||||||||||||
| Advisory Fees Paid, Amount | $ 2,000,000 | ||||||||||||||||||
| Investment Company, Portfolio Turnover | 65.00% | ||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key fund statistics
|
||||||||||||||||||
| Holdings [Text Block] | Portfolio holdings by sector (percent of net assets)
|