XML 51 R2.htm IDEA: XBRL DOCUMENT v3.25.4
Shareholder Report
 12 Months Ended
Dec. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name American Funds Fundamental Investors
Entity Central Index Key 0000039473
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 2025
Fundamental Investors Class A - ANCFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class A
Trading Symbol ANCFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors
 
(the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-A
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$
64		0.57
%
Expenses Paid, Amount $ 64
Expense Ratio, Percent 0.57%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class A shares gained 24.29% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-A
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class A (with sales
charge)
*
17.14
%
13.11
%
13.42
%
Fundamental Investors — Class A (without sales
charge)
*
24.29
%
14.46
%
14.09
%
S&P 500
Index
†
17.88
%
14.42
%
14.82
%
MSCI World
Index
†
21.09
%
12.15
%
12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class C - AFICX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class C
Trading Symbol AFICX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-C
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$
149		 1.33
%
Expenses Paid, Amount $ 149
Expense Ratio, Percent 1.33%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class C shares gained 23.35% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-C
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class C (with sales
charge)
*
 22.35
%
 13.61
%
 13.39
%
Fundamental Investors — Class C (without sales
charge)
*
 23.35
%
 13.61
%
 13.39
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund
statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class T - TFFFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class T
Trading Symbol TFFFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature
. 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/mutual-fund-literature
Expenses [Text Block]
What were the fund costs for the last year?
(
based
on a hypothet
ica
l $10,000
invest
ment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class T
$
37		0.33
%
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.33%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class T shares gained 24.60% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
Since inception
1
Fundamental Investors — Class T (with sales
charge)
2
21.47
%
14.17
%
13.85
%
Fundamental Investors — Class T (without sales
charge)
2
24.60
%
14.75
%
14.18
%
S&P 500
Index
3
17.88
%
14.42
%
14.89
%
MSCI World
Index
3
21.09
%
12.15
%
12.36
%
1
Class T shares were first offered on April 7, 2017.
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): S&P Dow Jones Indices LLC and MSCI.
Performance Inception Date Apr. 07, 2017
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(
percent
of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class F-1 - AFIFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class F-1
Trading Symbol AFIFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-F1
Expenses [Text Block]
What were the fund costs for the last year?
(
based
on a hyp
o
thetical $10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-1
$
72		0.64
%
Expenses Paid, Amount $ 72
Expense Ratio, Percent 0.64%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class F-1 shares gained 24.19% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-F1
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
F-1
*
24.19
%
14.40
%
14.02
%
S&P 500
Index
†
17.88
%
14.42
%
14.82
%
MSCI World
Index
†
21.09
%
12.15
%
12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund
statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class F-2 - FINFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class F-2
Trading Symbol FINFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors
 
(the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-F2
Expenses [Text Block]
What were the fund costs for the last
y
ear?
(b
ased
on a
hypothetical
$10
,00
0
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-2
$
43		0.38
%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.38%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class F-2 shares gained 24.52% for the year ended December 31, 2025.
That
result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-F2
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
F-2
*
24.52
%
14.70
%
14.32
%
S&P 500
Index
†
17.88
%
14.42
%
14.82
%
MSCI World
Index
†
21.09
%
12.15
%
12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class F-3 - FUNFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class F-3
Trading Symbol FUNFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-F3
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypot
het
ical $10,000 i
n
vest
ment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class F-3
$
31		0.28
%
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.28%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class F-3 shares gained 24.67% for the year ended December 31, 2025.
That
result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-F3
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
Since inception
1
Fundamental Investors — Class
F-3
2
24.67
%
14.82
%
14.26
%
S&P 500
Index
3
17.88
%
14.42
%
14.95
%
MSCI World
Index
3
21.09
%
12.15
%
12.43
%
1
Class F-3 shares were first offered on January 27, 2017.
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): S&P Dow Jones Indices LLC and MSCI.
Performance Inception Date Jan. 27, 2017
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class 529-A - CFNAX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class 529-A
Trading Symbol CFNAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-529A
Expenses [Text Block]
What were the fund costs for the last year?
(b
ase
d on a hypothetic
al $1
0,000
in
vest
m
ent)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-A
$
68		0.61
%
Expenses Paid, Amount $ 68
Expense Ratio, Percent 0.61%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class 529-A shares gained 24.24% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-529A
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class 529-A (with sales
charge)
*
19.90
%
13.60
%
13.62
%
Fundamental Investors — Class 529-A (without sales
charge)
*
24.24
%
14.41
%
14.03
%
S&P 500
Index
†
17.88
%
14.42
%
14.82
%
MSCI World
Index
†
21.09
%
12.15
%
12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statist
ics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class 529-C - CFNCX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class 529-C
Trading Symbol CFNCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-529C
Expenses [Text Block]
What were the fund costs for the last year?
(based
on a
hypotheti
cal
$10,000
investment
)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-C
$
154		1.38
%
Expenses Paid, Amount $ 154
Expense Ratio, Percent 1.38%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class 529-C shares gained 23.29% for the year ended December 31, 2025. That result c
ompare
s with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-529C
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class 529-C (with sales
charge)
*
22.29
%
13.55
%
13.60
%
Fundamental Investors — Class 529-C (without sales
charge)
*
23.29
%
13.55
%
13.60
%
S&P 500
Index
†
17.88
%
14.42
%
14.82
%
MSCI World
Index
†
21.09
%
12.15
%
12.17
%
*
Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee
waiver
s and/or expense reimbursements, without which they would have been lower.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class 529-E - CFNEX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class 529-E
Trading Symbol CFNEX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-529E
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypot
heti
cal $
10,000
i
nvest
ment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-E
$
95		0.85
%
Expenses Paid, Amount $ 95
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class 529-E shares gained 23.94% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-529E
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
529-E
*
23.94
%
14.15
%
13.76
%
S&P 500
Index
†
17.88
%
14.42
%
14.82
%
MSCI World
Index
†
21.09
%
12.15
%
12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in m
illi
ons)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class 529-T - TIIIX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class 529-T
Trading Symbol TIIIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature
. 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/mutual-fund-literature
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hyp
oth
etical $
10,000
in
vestmen
t)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-T
$
43		0.38
%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.38%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class 529-T shares gained 24.55% for
the year e
nded December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
Since inception
1
Fundamental Investors — Class 529-T (with sales
charge)
2
21.44
%
14.10
%
13.78
%
Fundamental Investors — Class 529-T (without sales
charge)
2
24.55
%
14.68
%
14.11
%
S&P 500
Index
3
17.88
%
14.42
%
14.89
%
MSCI World
Index
3
21.09
%
12.15
%
12.36
%
1
Class 529-T shares were first offered on April 7, 2017.
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): S&P Dow Jones Indices LLC and MSCI.
Performance Inception Date Apr. 07, 2017
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class 529-F-1 - CFNFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class 529-F-1
Trading Symbol CFNFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-529F1
. 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/mutual-fund-literature-529F1
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-1
$
50		 0.45
%
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.45%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class 529-F-1 shares gained 24.42% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-529F1
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
529-F-1
*
 24.42
%
 14.62
%
 14.26
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(
percent
of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class 529-F-2 - FFXFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class 529-F-2
Trading Symbol FFXFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-529F2
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000
investme
nt)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-2
$
42		 0.37
%
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.37%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class 529-F-2 shares gained 24.55% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-529F2
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
Since inception
1
Fundamental Investors — Class
529-F-2
2
 24.55
%
 14.70
%
 17.68
%
S&P 500
Index
3
 17.88
%
 14.42
%
 17.08
%
MSCI World
Index
3
 21.09
%
 12.15
%
 15.28
%
1
Class 529-F-2 shares were first offered on October 30, 2020.
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
lowe
r.
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): S&P Dow Jones Indices LLC and MSCI.
Performance Inception Date Oct. 30, 2020
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class 529-F-3 - FEEFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class 529-F-3
Trading Symbol FEEFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-529F3
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 529-F-3
$
37		 0.33
%
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.33%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class 529-F-3 shares gained 24.59% for the year ended December 31, 2025. That result c
ompares
with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-529F3
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
Since inception
1
Fundamental Investors — Class
529-F-3
2
 24.59
%
 14.75
%
 17.74
%
S&P 500
Index
3
 17.88
%
 14.42
%
 17.08
%
MSCI World
Index
3
 21.09
%
 12.15
%
 15.28
%
1
Class 529-F-3 shares were first offered on October 30, 2020.
2
Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, result
s reflect fee wa
ivers 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): S&P Dow Jones Indices LLC and MSCI.
Performance Inception Date Oct. 30, 2020
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(perce
nt of net as
sets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-1 - RFNAX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-1
Trading Symbol RFNAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-R1
. 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/mutual-fund-literature-R1
Expenses [Text Block]
What were the fund costs for the last year?
(based on a h
ypotheti
cal $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-1
$
152		 1.36
%
Expenses Paid, Amount $ 152
Expense Ratio, Percent 1.36%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-1 shares gained 23.30% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-R1
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
R-1
*
 23.30
%
 13.58
%
 13.20
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of
net a
ssets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-2 - RFNBX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-2
Trading Symbol RFNBX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-R2
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-2
$
153		 1.37
%
Expenses Paid, Amount $ 153
Expense Ratio, Percent 1.37%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-2 shares gained 23.29% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-R2
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
R-2
*
 23.29
%
 13.57
%
 13.20
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Inve
sto
rs cannot invest directly in an index. Source(s): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-2E- RFEBX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-2E
Trading Symbol RFEBX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-R2E
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-2E
$
120		 1.07
%
Expenses Paid, Amount $ 120
Expense Ratio, Percent 1.07%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-2E shares gained 23.66% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, p
lease refer
to
capitalgroup.com/mutual-fund-returns-R2E
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average ann
ual to
tal returns
1 year
5 years
10 years
Fundamental Investors — Class
R-2E
*
 23.66
%
 13.90
%
 13.54
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-3 - RFNCX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-3
Trading Symbol RFNCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-R3
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-3
$
103		 0.92
%
Expenses Paid, Amount $ 103
Expense Ratio, Percent 0.92%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-3 shares gained 23.85% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-R3
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
R-3
*
 23.85
%
 14.07
%
 13.70
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (
in
millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-4 - RFNEX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-4
Trading Symbol RFNEX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-R4
Expenses [Text Block]
What were the fund costs for the last year?
(based
on
a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-4
$
70		 0.62
%
Expenses Paid, Amount $ 70
Expense Ratio, Percent 0.62%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-4 shares gained 24.24% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-R4
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total
returns
1 year
5 years
10 years
Fundamental Investors — Class
R-4
*
 24.24
%
 14.42
%
 14.04
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover
rate
 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-5E - RFNHX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-5E
Trading Symbol RFNHX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-R5E
Expenses [Text Block]
What were the fund costs for the last year?
(based on a
hypothetical
$10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-5E
$
47		 0.42
%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.42%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-5E shares gained 24.47% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-R5E
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total
returns
1 year
5 years
10 years
Fundamental Investors — Class
R-5E
*
 24.47
%
 14.64
%
 14.26
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund
net
assets (in millions)
$
161,771
Total number of portfolio holdings 235
Total
advisory
fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-5 - RFNFX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-5
Trading Symbol RFNFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-R5
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $
10,000
investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-5
$
37		 0.33
%
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.33%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-5 shares gained 24.60% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-R5
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total
returns
1 year
5 years
10 years
Fundamental Investors — Class
R-5
*
 24.60
%
 14.76
%
 14.38
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net
assets
(in millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart
Fundamental Investors Class R-6 - RFNGX  
Shareholder Report [Line Items]  
Fund Name Fundamental Investors®
Class Name Class R-6
Trading Symbol RFNGX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Fundamental Investors (the "fund") for the period from January 1, 2025 to December 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at
capitalgroup.com/mutual-fund-literature-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/mutual-fund-literature-R6
Expenses [Text Block]
What were the fund costs for the last year?
(based on a hypothetical $10,000 investment)
Share class
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R-6
$
31		 0.28
%
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.28%
Factors Affecting Performance [Text Block]
Management's discussion of fund performance
The fund’s Class R-6 shares gained 24.68% for the year ended December 31, 2025. That result compares with a 17.88% gain for the S&P 500 Index. For information on returns for additional periods, including the fund lifetime, please refer to
capitalgroup.com/mutual-fund-returns-R6
.
What factors influenced results
U.S. equities delivered solid returns in 2025, supported by strong gains from growth sectors. The S&P 500 climbed to record highs, driven by resilient consumer spending and moderating inflation. Strong consumer spending boosted the U.S. economy, with particularly strong growth in the third quarter. However, persistent labor market softness prompted the U.S. Federal Reserve to deliver three 25-basis-point rate cuts during the year.
Most sectors posted gains for the fund, with information technology, industrials and consumer staples contributing significantly. Returns from communication services and materials were also positive.
Conversely, the health care sector was a detractor from overall results.
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] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average annual total returns
1 year
5 years
10 years
Fundamental Investors — Class
R-6
*
 24.68
%
 14.82
%
 14.44
%
S&P 500
Index
†
 17.88
%
 14.42
%
 14.82
%
MSCI World
Index
†
 21.09
%
 12.15
%
 12.17
%
*
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.
†
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): S&P Dow Jones Indices LLC and MSCI.
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 $ 161,771,000,000
Holdings Count | Holding 235
Advisory Fees Paid, Amount $ 355,000,000
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key fund statistics
Fund net assets (
in
millions)
$
161,771
Total number of portfolio holdings 235
Total advisory fees paid (in millions)
$
355
Portfolio turnover rate 26
%
Holdings [Text Block]
Portfolio holdings by sector 
(percent of net assets)
Graphical Representation - Allocation 1 Chart