v3.25.2
Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name DEUTSCHE DWS SECURITIES TRUST
Entity Central Index Key 0000088048
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000099770  
Shareholder Report [Line Items]  
Fund Name DWS Digital Horizons Fund
Class Name Class A
Trading Symbol COMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about DWS Digital Horizons Fund (formerly, DWS Communications Fund) (the "Fund") for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number (800) 728-3337
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">dws.com/mutualreports</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Fund
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$70
1.31%Footnote Reference(a)
FootnoteDescription
Footnote(a)
Annualized.

 

Gross expense ratio as of the latest prospectus: 1.46%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.31% [1]
AssetsNet $ 106,529,407
Holdings Count | Holding 60
Advisory Fees Paid, Amount $ 345,937
InvestmentCompanyPortfolioTurnover 78.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets ($)
106,529,407
Number of Portfolio Holdings
60
Portfolio Turnover Rate (%)
78
Total Net Advisory Fees Paid ($)
345,937
Holdings [Text Block]

Asset Allocation

Asset Type
% of Net Assets
Common Stocks
97%
Cash Equivalents
3%
Other Assets and Liabilities, Net
0%
Total
100%

Sector Allocation

Sector
% of Net Assets
Software
19%
Entertainment
15%
Semiconductors & Semiconductor Equipment
15%
Broadline Retail
9%
Technology Hardware, Storage & Peripherals
8%
Interactive Media & Services
6%
IT Services
5%
Diversified Telecommunication Services
3%
Hotels, Restaurants & Leisure
3%
Media
3%
Financial Services
2%
Specialized REITs
2%
Ground Transportation
2%
Other Industries
7%

Ten Largest Equity Holdings

Holdings
54.3% of Net Assets
NVIDIA Corp.
11.9%
Microsoft Corp.
9.5%
Apple, Inc.
7.3%
Amazon.com, Inc.
7.3%
Meta Platforms, Inc.
4.5%
ROBLOX Corp.
3.5%
Broadcom, Inc.
2.8%
Spotify Technology SA
2.7%
Netflix, Inc.
2.6%
AT&T, Inc.
2.2%
C000237496  
Shareholder Report [Line Items]  
Fund Name DWS Digital Horizons Fund
Class Name Class S
Trading Symbol COMSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about DWS Digital Horizons Fund (formerly, DWS Communications Fund) (the "Fund") for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number (800) 728-3337
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">dws.com/mutualreports</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Fund
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class S
$55
1.03%Footnote Reference(a)
FootnoteDescription
Footnote(a)
Annualized.

 

Gross expense ratio as of the latest prospectus: 1.31%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.03% [2]
AssetsNet $ 106,529,407
Holdings Count | Holding 60
Advisory Fees Paid, Amount $ 345,937
InvestmentCompanyPortfolioTurnover 78.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets ($)
106,529,407
Number of Portfolio Holdings
60
Portfolio Turnover Rate (%)
78
Total Net Advisory Fees Paid ($)
345,937
Holdings [Text Block]

Asset Allocation

Asset Type
% of Net Assets
Common Stocks
97%
Cash Equivalents
3%
Other Assets and Liabilities, Net
0%
Total
100%

Sector Allocation

Sector
% of Net Assets
Software
19%
Entertainment
15%
Semiconductors & Semiconductor Equipment
15%
Broadline Retail
9%
Technology Hardware, Storage & Peripherals
8%
Interactive Media & Services
6%
IT Services
5%
Diversified Telecommunication Services
3%
Hotels, Restaurants & Leisure
3%
Media
3%
Financial Services
2%
Specialized REITs
2%
Ground Transportation
2%
Other Industries
7%

Ten Largest Equity Holdings

Holdings
54.3% of Net Assets
NVIDIA Corp.
11.9%
Microsoft Corp.
9.5%
Apple, Inc.
7.3%
Amazon.com, Inc.
7.3%
Meta Platforms, Inc.
4.5%
ROBLOX Corp.
3.5%
Broadcom, Inc.
2.8%
Spotify Technology SA
2.7%
Netflix, Inc.
2.6%
AT&T, Inc.
2.2%
C000099773  
Shareholder Report [Line Items]  
Fund Name DWS Digital Horizons Fund
Class Name Institutional Class
Trading Symbol COMZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about DWS Digital Horizons Fund (formerly, DWS Communications Fund) (the "Fund") for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.
Additional Information Phone Number (800) 728-3337
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">dws.com/mutualreports</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Fund
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$55
1.03%Footnote Reference(a)
FootnoteDescription
Footnote(a)
Annualized.

 

Gross expense ratio as of the latest prospectus: 1.22%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.03% [3]
AssetsNet $ 106,529,407
Holdings Count | Holding 60
Advisory Fees Paid, Amount $ 345,937
InvestmentCompanyPortfolioTurnover 78.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets ($)
106,529,407
Number of Portfolio Holdings
60
Portfolio Turnover Rate (%)
78
Total Net Advisory Fees Paid ($)
345,937
Holdings [Text Block]

Asset Allocation

Asset Type
% of Net Assets
Common Stocks
97%
Cash Equivalents
3%
Other Assets and Liabilities, Net
0%
Total
100%

Sector Allocation

Sector
% of Net Assets
Software
19%
Entertainment
15%
Semiconductors & Semiconductor Equipment
15%
Broadline Retail
9%
Technology Hardware, Storage & Peripherals
8%
Interactive Media & Services
6%
IT Services
5%
Diversified Telecommunication Services
3%
Hotels, Restaurants & Leisure
3%
Media
3%
Financial Services
2%
Specialized REITs
2%
Ground Transportation
2%
Other Industries
7%

Ten Largest Equity Holdings

Holdings
54.3% of Net Assets
NVIDIA Corp.
11.9%
Microsoft Corp.
9.5%
Apple, Inc.
7.3%
Amazon.com, Inc.
7.3%
Meta Platforms, Inc.
4.5%
ROBLOX Corp.
3.5%
Broadcom, Inc.
2.8%
Spotify Technology SA
2.7%
Netflix, Inc.
2.6%
AT&T, Inc.
2.2%
[1] Annualized.
[2] Annualized.
[3] Annualized.