v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
C000007056 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000007056 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000007056 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 61.20%
C000007056 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000007056 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.30%
C000007056 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000007056 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.70%
C000007056 [Member] | Rights [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000007055 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000007055 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000007055 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 61.20%
C000007055 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000007055 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.30%
C000007055 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000007055 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.70%
C000007055 [Member] | Rights [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000007054 [Member] | Other Assets and Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000007054 [Member] | Asset Backed Commercial Mortgage Backed Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000007054 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 61.20%
C000007054 [Member] | Sovereign Debt [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000007054 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 26.30%
C000007054 [Member] | Taxable Municipal Bonds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
C000007054 [Member] | Corporate Bond Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.70%
C000007054 [Member] | Rights [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%