Net Assets Investment Company, Portfolio Turnover C000092891 [Member] American Funds Tax-Exempt Fund of New York® - Class A C000092893 [Member] American Funds Tax-Exempt Fund of New York® - Class C C000189479 [Member] American Funds Tax-Exempt Fund of New York® - Class T C000092894 [Member] American Funds Tax-Exempt Fund of New York® - Class F-1 C000092895 [Member] American Funds Tax-Exempt Fund of New York® - Class F-2 C000180002 [Member] American Funds Tax-Exempt Fund of New York® - Class F-3 Investment Type [Axis] AAAAaa [Member] AAA/Aaa [Member] AAAa [Member] AA/Aa [Member] AA [Member] A/A [Member] BBBBaa [Member] BBB/Baa [Member] Below Investment Grade [Member] Below Investment grade [Member] Unrated [Member] Short Term Securities And Other Assets Less Liabilities [Member] Short-term securities & other assets less liabilities [Member]