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Shareholder Report
 12 Months Ended
Dec. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name BNY Mellon Large Cap Securities Fund, Inc.
Entity Central Index Key 0000030146
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 2025
C000000105 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Large Cap Securities Fund, Inc.
Class Name BNY Mellon Large Cap Securities Fund, Inc.
Trading Symbol DREVX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BNY Mellon Large Cap Securities Fund, Inc. (the “Fund”) for the period of 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 bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last year ?
(based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
BNY Mellon Large Cap Securities Fund, Inc. $75 0.69%
Expenses Paid, Amount $ 75
Expense Ratio, Percent 0.69%
Factors Affecting Performance [Text Block]
How did the Fund perform last year ?
  • For the 12-month period ended December 31, 2025, the Fund’s shares returned 16.69%.
  • In comparison, the S&P 500® Index (the “Index”) returned 17.87% for the same period.
What affected the Fund’s performance?
  • The U.S. large-cap market advanced during the reporting period, supported by strong earnings growth, heavy investment in artificial intelligence ad infrastructure, and resilient consumer and business spending.
  • Strong stock selection in financials and utilities contributed positively to the Fund’s relative returns. Underweight positions and positive stock selection in consumer discretionary and consumer staples further supported performance.
  • Weak stock selection in health care detracted most from relative performance, with additional pressure coming from stock selection in industrials.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from January 1 , 2015 through December 31, 2025
Initial Investment of $10,000
Fund Performance - Growth of 10K Chart
The above graph compares a hypothetical $10,000 investment in the Fund’s shares to a hypothetical investment of $10,000 made in the S&P 500® Index on 12/31/2015. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the Index is not subject to charges, fees and other expenses. Investors cannot invest directly in any index.
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (AS OF 12/31/25 )
1YR 5YR 10YR
BNY Mellon Large Cap Securities Fund, Inc. 16.69% 15.27% 15.33%
S&P 500® Index 17.87% 14.42% 14.81%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] For more current information visit bny.com/investments/literaturecenter . 
Net Assets $ 2,363,000,000
Holdings Count | Holding 52
Advisory Fees Paid, Amount $ 14,614,495
Investment Company Portfolio Turnover 26.04%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 12/31/25 )

Fund Size (Millions)
Number of Holdings		 Total Advisory Fee Paid During
Period
Annual Portfolio Turnover
$2,363 52 $14,614,495 26.04%
Holdings [Text Block]
Portfolio Holdings (as of 12/31/25 )
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
Sector Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.