Shareholder Report, Holdings (Details)

Jun. 30, 2026

C000000793 [Member] | Investment Companies Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

6.00%

C000000793 [Member] | Net Other Assets and Liabilities Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

(0.50%)

C000000793 [Member] | Consumer Cyclical [Member]

Holdings [Line Items]

Percent of Net Asset Value

13.00%

C000000793 [Member] | Consumer Non cyclical [Member]

Holdings [Line Items]

Percent of Net Asset Value

15.70%

C000000793 [Member] | Basic Materials [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.50%

C000000793 [Member] | Utilities Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.80%

C000000793 [Member] | Industrial Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

10.10%

C000000793 [Member] | Communications Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

19.80%

C000000793 [Member] | Technology Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

2.40%

C000000793 [Member] | Financial Services Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

12.30%

C000000793 [Member] | Energy Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

10.70%

C000000793 [Member] | Unfunded Floating Rate Loan Interests Commitments [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.00%

^[1]

C000000793 [Member] | Forward Foreign Currency Exchange Contracts [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.00%

^[1]

C000000793 [Member] | Equity Securities Preferred Stocks [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000793 [Member] | Equity Securities Common Stocks [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000793 [Member] | Fixed Rate Loan Interests [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000793 [Member] | Convertible Corporate Bonds and Notes [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.80%

C000000793 [Member] | Floating Rate Loan Interests [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.60%

C000000793 [Member] | Corporate Bonds and Notes [Member]

Holdings [Line Items]

Percent of Net Asset Value

87.70%

C000000793 [Member] | Net Other Assets and Liabilities [Member]

Holdings [Line Items]

Percent of Net Asset Value

(0.60%)

C000000793 [Member] | Investment Companies [Member]

Holdings [Line Items]

Percent of Net Asset Value

6.00%

C000000793 [Member] | Asset Backed Securities [Member]

Holdings [Line Items]

Percent of Net Asset Value

1.20%

C000000793 [Member] | Collateralized Loan Obligations [Member]

Holdings [Line Items]

Percent of Net Asset Value

1.20%

C000000792 [Member] | Investment Companies Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

6.00%

C000000792 [Member] | Net Other Assets and Liabilities Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

(0.50%)

C000000792 [Member] | Consumer Cyclical [Member]

Holdings [Line Items]

Percent of Net Asset Value

13.00%

C000000792 [Member] | Consumer Non cyclical [Member]

Holdings [Line Items]

Percent of Net Asset Value

15.70%

C000000792 [Member] | Basic Materials [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.50%

C000000792 [Member] | Utilities Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.80%

C000000792 [Member] | Industrial Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

10.10%

C000000792 [Member] | Communications Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

19.80%

C000000792 [Member] | Technology Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

2.40%

C000000792 [Member] | Financial Services Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

12.30%

C000000792 [Member] | Energy Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

10.70%

C000000792 [Member] | Unfunded Floating Rate Loan Interests Commitments [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.00%

^[2]

C000000792 [Member] | Forward Foreign Currency Exchange Contracts [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.00%

^[2]

C000000792 [Member] | Equity Securities Preferred Stocks [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000792 [Member] | Equity Securities Common Stocks [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000792 [Member] | Fixed Rate Loan Interests [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000792 [Member] | Convertible Corporate Bonds and Notes [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.80%

C000000792 [Member] | Floating Rate Loan Interests [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.60%

C000000792 [Member] | Corporate Bonds and Notes [Member]

Holdings [Line Items]

Percent of Net Asset Value

87.70%

C000000792 [Member] | Net Other Assets and Liabilities [Member]

Holdings [Line Items]

Percent of Net Asset Value

(0.60%)

C000000792 [Member] | Investment Companies [Member]

Holdings [Line Items]

Percent of Net Asset Value

6.00%

C000000792 [Member] | Asset Backed Securities [Member]

Holdings [Line Items]

Percent of Net Asset Value

1.20%

C000000792 [Member] | Collateralized Loan Obligations [Member]

Holdings [Line Items]

Percent of Net Asset Value

1.20%

C000000790 [Member] | Investment Companies Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

6.00%

C000000790 [Member] | Net Other Assets and Liabilities Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

(0.50%)

C000000790 [Member] | Consumer Cyclical [Member]

Holdings [Line Items]

Percent of Net Asset Value

13.00%

C000000790 [Member] | Consumer Non cyclical [Member]

Holdings [Line Items]

Percent of Net Asset Value

15.70%

C000000790 [Member] | Basic Materials [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.50%

C000000790 [Member] | Utilities Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.80%

C000000790 [Member] | Industrial Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

10.10%

C000000790 [Member] | Communications Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

19.80%

C000000790 [Member] | Technology Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

2.40%

C000000790 [Member] | Financial Services Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

12.30%

C000000790 [Member] | Energy Sector [Member]

Holdings [Line Items]

Percent of Net Asset Value

10.70%

C000000790 [Member] | Unfunded Floating Rate Loan Interests Commitments [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.00%

^[3]

C000000790 [Member] | Forward Foreign Currency Exchange Contracts [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.00%

^[3]

C000000790 [Member] | Equity Securities Preferred Stocks [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000790 [Member] | Equity Securities Common Stocks [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000790 [Member] | Fixed Rate Loan Interests [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.10%

C000000790 [Member] | Convertible Corporate Bonds and Notes [Member]

Holdings [Line Items]

Percent of Net Asset Value

0.80%

C000000790 [Member] | Floating Rate Loan Interests [Member]

Holdings [Line Items]

Percent of Net Asset Value

4.60%

C000000790 [Member] | Corporate Bonds and Notes [Member]

Holdings [Line Items]

Percent of Net Asset Value

87.70%

C000000790 [Member] | Net Other Assets and Liabilities [Member]

Holdings [Line Items]

Percent of Net Asset Value

(0.60%)

C000000790 [Member] | Investment Companies [Member]

Holdings [Line Items]

Percent of Net Asset Value

6.00%

C000000790 [Member] | Asset Backed Securities [Member]

Holdings [Line Items]

Percent of Net Asset Value

1.20%

C000000790 [Member] | Collateralized Loan Obligations [Member]

Holdings [Line Items]

Percent of Net Asset Value

1.20%

[1]	Amount represents less than .1%.
[2]	Amount represents less than .1%.
[3]	Amount represents less than .1%.