v3.26.1
Shareholder Report, Holdings (Details)
Feb. 28, 2026
C000001519 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.70% [1]
C000001519 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 22.60% [1]
C000001519 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.00% [1]
C000001519 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 17.90% [1]
C000001519 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 46.00% [1]
C000001519 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [1]
C000001519 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000137687 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.70% [2]
C000137687 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 22.60% [2]
C000137687 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.00% [2]
C000137687 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 17.90% [2]
C000137687 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 46.00% [2]
C000137687 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [2]
C000137687 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001516 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.70% [3]
C000001516 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 22.60% [3]
C000001516 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.00% [3]
C000001516 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 17.90% [3]
C000001516 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 46.00% [3]
C000001516 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [3]
C000001516 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001524 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.70% [4]
C000001524 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.30% [4]
C000001524 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.10% [4]
C000001524 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 25.60% [4]
C000001524 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.90% [4]
C000001524 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [4]
C000001524 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000137688 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.70% [5]
C000137688 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.30% [5]
C000137688 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.10% [5]
C000137688 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 25.60% [5]
C000137688 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.90% [5]
C000137688 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [5]
C000137688 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001527 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.70% [6]
C000001527 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.30% [6]
C000001527 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.10% [6]
C000001527 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 25.60% [6]
C000001527 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 51.90% [6]
C000001527 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.40% [6]
C000001527 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001531 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40% [7]
C000001531 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.30% [7]
C000001531 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.80% [7]
C000001531 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.90% [7]
C000001531 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 47.60% [7]
C000001531 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [7]
C000001531 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000137689 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40% [8]
C000137689 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.30% [8]
C000137689 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.80% [8]
C000137689 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.90% [8]
C000137689 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 47.60% [8]
C000137689 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [8]
C000137689 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001528 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40% [9]
C000001528 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.30% [9]
C000001528 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.80% [9]
C000001528 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.90% [9]
C000001528 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 47.60% [9]
C000001528 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [9]
C000001528 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001536 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80% [10]
C000001536 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 10.40% [10]
C000001536 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50% [10]
C000001536 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.90% [10]
C000001536 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 49.00% [10]
C000001536 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.40% [10]
C000001536 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000137690 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80% [11]
C000137690 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 10.40% [11]
C000137690 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50% [11]
C000137690 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.90% [11]
C000137690 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 49.00% [11]
C000137690 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.40% [11]
C000137690 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001539 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80% [12]
C000001539 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 10.40% [12]
C000001539 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50% [12]
C000001539 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 16.90% [12]
C000001539 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 49.00% [12]
C000001539 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.40% [12]
C000001539 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001543 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [13]
C000001543 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.70% [13]
C000001543 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 22.00% [13]
C000001543 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [13]
C000001543 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 35.90% [13]
C000001543 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50% [13]
C000001543 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000137691 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [14]
C000137691 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.70% [14]
C000137691 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 22.00% [14]
C000137691 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [14]
C000137691 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 35.90% [14]
C000137691 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50% [14]
C000137691 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000001540 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.90% [15]
C000001540 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.70% [15]
C000001540 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 22.00% [15]
C000001540 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [15]
C000001540 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 35.90% [15]
C000001540 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50% [15]
C000001540 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00%
C000023361 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30% [16],[17]
C000023361 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 53.40% [16],[17]
C000023361 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.20% [16],[17]
C000023361 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 14.50% [16],[17]
C000023361 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 14.20% [16],[17]
C000023361 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40% [16],[17]
C000023361 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00% [17]
C000137692 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30% [18],[19]
C000137692 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 53.40% [18],[19]
C000137692 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.20% [18],[19]
C000137692 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 14.50% [18],[19]
C000137692 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 14.20% [18],[19]
C000137692 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40% [18],[19]
C000137692 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00% [19]
C000023364 [Member] | BB or Lower [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30% [20],[21]
C000023364 [Member] | N R not rated [Member]  
Holdings [Line Items]  
Percent of Total Investments 53.40% [20],[21]
C000023364 [Member] | Standard & Poor's, BBB Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.20% [20],[21]
C000023364 [Member] | Standard & Poor's, A Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 14.50% [20],[21]
C000023364 [Member] | Standard & Poor's, AA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 14.20% [20],[21]
C000023364 [Member] | Standard & Poor's, AAA Rating [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40% [20],[21]
C000023364 [Member] | Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Total Investments 100.00% [21]
[1] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[2] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[3] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[4] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[5] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[6] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[7] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[8] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[9] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[10] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[11] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[12] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[13] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[14] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[15] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[16] The ratings disclosed are the lowest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[17] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
[18] The ratings disclosed are the lowest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[19] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
[20] The ratings disclosed are the lowest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
[21] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.