v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
C000105308 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000105308 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000105308 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000105308 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.80%
C000105308 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.10%
C000024520 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000024520 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000024520 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000024520 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.80%
C000024520 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.10%
C000007058 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000007058 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000007058 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000007058 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.80%
C000007058 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.10%
C000046841 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000046841 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000046841 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000046841 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.80%
C000046841 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.10%
C000007057 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000007057 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000007057 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000007057 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.80%
C000007057 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.10%
C000046842 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000046842 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000046842 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000046842 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 52.80%
C000046842 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 41.20%
C000209800 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000209800 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000209800 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000209800 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 52.80%
C000209800 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 41.20%
C000024522 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000024522 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000024522 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000024522 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 52.80%
C000024522 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 41.20%
C000105309 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000105309 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000105309 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
C000105309 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 52.80%
C000105309 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 41.20%
C000105311 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000105311 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000105311 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000105311 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 69.30%
C000105311 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000105310 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000105310 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000105310 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000105310 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 69.30%
C000105310 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000007061 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000007061 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000007061 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000007061 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 69.30%
C000007061 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000046843 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000046843 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000046843 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000046843 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 69.30%
C000046843 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000007060 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000007060 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000007060 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000007060 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 69.30%
C000007060 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.50%
C000007062 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000007062 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000007062 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000007062 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 67.90%
C000007062 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.40%
C000007062 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000046844 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000046844 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000046844 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000046844 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 67.90%
C000046844 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.40%
C000046844 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000007063 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000007063 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000007063 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000007063 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 67.90%
C000007063 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.40%
C000007063 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000007064 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000007064 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000007064 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000007064 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 67.90%
C000007064 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.40%
C000007064 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000081425 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000081425 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000081425 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000081425 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 67.90%
C000081425 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.40%
C000081425 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000170279 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000170279 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000170279 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000170279 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 67.90%
C000170279 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.40%
C000170279 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000054351 [Member] | Over 25 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000054351 [Member] | Twenty To 25 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000054351 [Member] | Fifteen To 20 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000054351 [Member] | Ten To 15 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000054351 [Member] | Five To 10 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.60%
C000054351 [Member] | Zero To 5 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 48.90%
C000054351 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000054350 [Member] | Over 25 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000054350 [Member] | Twenty To 25 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000054350 [Member] | Fifteen To 20 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000054350 [Member] | Ten To 15 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000054350 [Member] | Five To 10 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.60%
C000054350 [Member] | Zero To 5 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 48.90%
C000054350 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000054349 [Member] | Over 25 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000054349 [Member] | Twenty To 25 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000054349 [Member] | Fifteen To 20 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000054349 [Member] | Ten To 15 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000054349 [Member] | Five To 10 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.60%
C000054349 [Member] | Zero To 5 Years [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 48.90%
C000054349 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000075027 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000075027 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000075027 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000075027 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 69.00%
C000075027 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.40%
C000075027 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
C000075028 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000075028 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000075028 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000075028 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 69.00%
C000075028 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 24.40%
C000075028 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%