Emerging Markets AI ETF Equity Market Risk [Member] Artificial Intelligence Risk [Member] Sector Risks [Member] Information Technology Sector Risk [Member] Technology Sector Risk [Member] Consumer Discretionary Sector Risk [Member] Utilities Sector Risk [Member] Energy Sector Risk [Member] Communications Services Sector Risk [Member] Industrials Sector Risk [Member] Foreign Securities Risk [Member] Emerging Markets Risk [Member] Frontier Markets Risk [Member] Depositary Receipts Risks [Member] Currency Exchange Rate Risk [Member] China Investing Risks [Member] China A-Shares Investment Risk [Member] China Variable Interest Equity Investment Risk [Member] Derivatives Risk [Member] Swap Agreements [Member] Forward Contracts [Member] Counterparty Risk [Member] IPO Risk [Member] Private Company Risk [Member] Economic and Market Risk [Member] ETF Risks [Member] Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member] Cash Redemption Risk [Member] Costs of Buying or Selling Shares [Member] Shares May Trade at Prices Other Than NAV [Member] Trading [Member] Geographic Investment Risk [Member] Management Risk [Member] Market Capitalization Risks [Member] Large-Capitalization Investing [Member] Mid-Capitalization Investing [Member] Small-Capitalization Investing [Member] New Fund Risk [Member] Newer Sub-Adviser Risk [Member] Operational Risk [Member] Emerging Markets AI ETF [Member] Emerging Markets AI ETF. Emerging Markets AI ETF. Operational Risk. Newer Sub-Adviser Risk. New Fund Risk. Small-Capitalization Investing. Mid-Capitalization Investing. Large-Capitalization Investing. Market Capitalization Risks. Management Risk. Geographic Investment Risk. Trading. Shares May Trade at Prices Other Than NAV. Costs of Buying or Selling Shares. Cash Redemption Risk. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. ETF Risks. Economic and Market Risk. Private Company Risk. IPO Risk. Counterparty Risk. Swap Agreements. Derivatives Risk. China Variable Interest Equity Investment Risk. China A-Shares Investment Risk. China Investing Risks. Currency Exchange Rate Risk. Depositary Receipts Risks. Frontier Markets Risk. Emerging Markets Risk. Foreign Securities Risk. Industrials Sector Risk. Communications Services Sector Risk. Energy Sector Risk. Utilities Sector Risk. Consumer Discretionary Sector Risk. Technology Sector Risk. Information Technology Sector Risk. Sector Risks. Artificial Intelligence Risk. Equity Market Risk.