N A not applicable [Member] N R not rated [Member] BB or Lower [Member] Investment Companies [Member] S And P Municipal Yield Index [Member] S And P Municipal Bond Index [Member] C000256223 [Member] Nuveen High Yield Municipal Income ETF Municipal Bonds [Member] Standard & Poor's, BBB Rating [Member] Standard & Poor's, A Rating [Member] Standard & Poor's, AA Rating [Member] Standard & Poor's, AAA Rating [Member] C000256224 [Member] Nuveen Municipal Income ETF Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag