v3.25.1
Shareholder Report, Holdings (Details)
Feb. 28, 2025
C000000496 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [1]
C000000496 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [1]
C000000496 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [1]
C000000496 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [1]
C000000496 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [1]
C000000496 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [1]
C000000498 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [2]
C000000498 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [2]
C000000498 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [2]
C000000498 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [2]
C000000498 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [2]
C000000498 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [2]
C000000497 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [3]
C000000497 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [3]
C000000497 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [3]
C000000497 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [3]
C000000497 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [3]
C000000497 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [3]
C000000495 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [4]
C000000495 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [4]
C000000495 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [4]
C000000495 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [4]
C000000495 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [4]
C000000495 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [4]
C000000499 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [5]
C000000499 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [5]
C000000499 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [5]
C000000499 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [5]
C000000499 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [5]
C000000499 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [5]
C000000500 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [6]
C000000500 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [6]
C000000500 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [6]
C000000500 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [6]
C000000500 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [6]
C000000500 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [6]
C000029703 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [7]
C000029703 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [7]
C000029703 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [7]
C000029703 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [7]
C000029703 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [7]
C000029703 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [7]
C000224183 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [8]
C000224183 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [8]
C000224183 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [8]
C000224183 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [8]
C000224183 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [8]
C000224183 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [8]
C000250407 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 71.60% [9]
C000250407 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.60% [9]
C000250407 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.80% [9]
C000250407 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.70% [9]
C000250407 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.20% [9]
C000250407 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 18.10% [9]
C000000503 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.40% [10]
C000000503 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 30.70% [10]
C000000503 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 38.00% [10]
C000000503 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30% [10]
C000000503 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.60% [10]
C000000503 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.00% [10]
C000000505 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.40% [11]
C000000505 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 30.70% [11]
C000000505 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 38.00% [11]
C000000505 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30% [11]
C000000505 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.60% [11]
C000000505 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.00% [11]
C000000504 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.40% [12]
C000000504 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 30.70% [12]
C000000504 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 38.00% [12]
C000000504 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30% [12]
C000000504 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.60% [12]
C000000504 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.00% [12]
C000000502 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.40% [13]
C000000502 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 30.70% [13]
C000000502 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 38.00% [13]
C000000502 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30% [13]
C000000502 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.60% [13]
C000000502 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.00% [13]
C000000506 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.40% [14]
C000000506 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 30.70% [14]
C000000506 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 38.00% [14]
C000000506 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30% [14]
C000000506 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.60% [14]
C000000506 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.00% [14]
C000000507 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.40% [15]
C000000507 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 30.70% [15]
C000000507 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 38.00% [15]
C000000507 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30% [15]
C000000507 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.60% [15]
C000000507 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.00% [15]
C000029704 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.40% [16]
C000029704 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 30.70% [16]
C000029704 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 38.00% [16]
C000029704 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30% [16]
C000029704 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.60% [16]
C000029704 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 12.00% [16]
C000000524 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [17]
C000000524 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [17]
C000000524 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [17]
C000000524 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [17]
C000000524 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [17]
C000000524 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [17]
C000000526 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [18]
C000000526 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [18]
C000000526 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [18]
C000000526 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [18]
C000000526 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [18]
C000000526 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [18]
C000000525 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [19]
C000000525 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [19]
C000000525 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [19]
C000000525 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [19]
C000000525 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [19]
C000000525 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [19]
C000000523 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [20]
C000000523 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [20]
C000000523 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [20]
C000000523 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [20]
C000000523 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [20]
C000000523 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [20]
C000000527 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [21]
C000000527 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [21]
C000000527 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [21]
C000000527 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [21]
C000000527 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [21]
C000000527 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [21]
C000000528 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [22]
C000000528 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [22]
C000000528 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [22]
C000000528 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [22]
C000000528 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [22]
C000000528 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [22]
C000029707 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [23]
C000029707 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [23]
C000029707 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [23]
C000029707 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [23]
C000029707 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [23]
C000029707 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [23]
C000224185 [Member] | One To 7 [Member]  
Holdings [Line Items]  
Percent of Total Investments 64.00% [24]
C000224185 [Member] | Eight To 30 [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.60% [24]
C000224185 [Member] | Thirty One To 60 [Member]  
Holdings [Line Items]  
Percent of Total Investments 3.40% [24]
C000224185 [Member] | Sixty One To 90 [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.80% [24]
C000224185 [Member] | Ninety One To 180 [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.30% [24]
C000224185 [Member] | One Hundred Eighty One Plus [Member]  
Holdings [Line Items]  
Percent of Total Investments 20.90% [24]
[1] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[2] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[3] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[4] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[5] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[6] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[7] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[8] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[9] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[10] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[11] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[12] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[13] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[14] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[15] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[16] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[17] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[18] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[19] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[20] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[21] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[22] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[23] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.
[24] The number of days to maturity of each holding is determined in accordance with the provisions of Rule 2a-7 under the Investment Company Act of 1940.