v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Natixis ETF Trust II
Entity Central Index Key 0001728860
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report
C000243076  
Shareholder Report [Line Items]  
Fund Name Natixis Loomis Sayles Focused Growth ETF
Trading Symbol LSGR
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Natixis Loomis Sayles Focused Growth ETF for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information (including tax information) about the Fund at im.natixis.com/funddocuments. You can also request the information by contacting us at (800) 862-4863 or by contacting your financial intermediary directly.
Additional Information Phone Number (800) 862-4863
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">im.natixis.com/funddocuments</span>
Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Natixis Loomis Sayles Focused Growth ETF
$28
0.59%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.59%
AssetsNet $ 839,492,478
Holdings Count | Holding 22
Advisory Fees Paid, Amount $ 1,811,711
InvestmentCompanyPortfolioTurnover 1.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$839,492,478
  • # of Portfolio Holdings (including overnight repurchase agreements)22
  • Portfolio Turnover Rate1%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$1,811,711
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Table Summary
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
6.0%
Short-Term Investments
4.6%
Aerospace & Defense
4.0%
Financial Services
4.1%
Beverages
4.7%
Entertainment
5.7%
Biotechnology
6.6%
Broadline Retail
7.1%
Automobiles
7.1%
Software
14.4%
Semiconductors & Semiconductor Equipment
16.0%
Interactive Media & Services
19.7%
Footnote Description
Footnote*
 Net of other assets less liabilities
Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.
16.0%
Alphabet, Inc., Class A
12.9%
Tesla, Inc.
7.1%
Amazon.com, Inc.
7.1%
Meta Platforms, Inc., Class A
6.8%
Vertex Pharmaceuticals, Inc.
4.8%
Microsoft Corp.
4.7%
Monster Beverage Corp.
4.7%
Visa, Inc., Class A
4.1%
Boeing Co.
4.0%
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 
Summary of Change Legend [Text Block]

There were no material fund changes during the period. 
C000220375  
Shareholder Report [Line Items]  
Fund Name Natixis Vaughan Nelson Select ETF
Trading Symbol VNSE
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Natixis Vaughan Nelson Select ETF for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information (including tax information) about the Fund at im.natixis.com/funddocuments. You can also request the information by contacting us at (800) 862-4863 or by contacting your financial intermediary directly.
Additional Information Phone Number (800) 862-4863
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">im.natixis.com/funddocuments</span>
Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Natixis Vaughan Nelson Select ETF
$41
0.80%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.80%
AssetsNet $ 14,122,205
Holdings Count | Holding 28
Advisory Fees Paid, Amount $ 0
InvestmentCompanyPortfolioTurnover 49.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$14,122,205
  • # of Portfolio Holdings (including overnight repurchase agreements)28
  • Portfolio Turnover Rate49%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$0
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Table Summary
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
18.5%
Capital Markets
3.0%
Banks
3.2%
Metals & Mining
3.3%
Trading Companies & Distributors
3.4%
Broadline Retail
4.0%
Electrical Equipment
4.1%
Aerospace & Defense
4.4%
Machinery
4.5%
Oil, Gas & Consumable Fuels
4.6%
Financial Services
5.0%
Technology Hardware, Storage & Peripherals
5.1%
Pharmaceuticals
7.0%
Interactive Media & Services
8.6%
Semiconductors & Semiconductor Equipment
21.3%
Footnote Description
Footnote*
 Net of other assets less liabilities
Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.
8.2%
Taiwan Semiconductor Manufacturing Co. Ltd., ADR
7.7%
Eli Lilly & Co.
7.0%
Alphabet, Inc., Class A
6.9%
Apple, Inc.
5.1%
Exxon Mobil Corp.
4.6%
Cummins, Inc.
4.5%
Eaton Corp. PLC
4.1%
Amazon.com, Inc.
4.0%
United Rentals, Inc.
3.4%
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 
Summary of Change Legend [Text Block]

There were no material fund changes during the period.