v3.26.1
Shareholder Report, Holdings (Details)
May 31, 2026
C000027570 | Vanguard S&P 500 ETF - ABFR_922908363  
Holdings [Line Items]  
Percent of Net Asset Value 18.90%
C000027570 | iShares Core MSCI Europe ETF - ABFR_46434V738  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027570 | United Kingdom Gilt, 4.75 - ABFR_B24FF0II3  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027570 | iShares Core MSCI Emerging Markets ETF - ABFR_46434G103  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027570 | U.S. Treasury Inflation Index, 0.375 - ABFR_912828V49  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000027570 | Brazil Notas do Tesouro Nacional, 10 - ABFR_ACI2MBMS7  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027570 | U.S. Treasury Inflation Index, 0.5 - ABFR_9128283R9  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000027570 | iShares MSCI Emerging Markets ex China ETF - ABFR_46434G764  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000027570 | Canadian Government Bond, 3.5 - ABFR_135087S70  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027570 | S&P 500 Index - ABFR_ADI3B32S5  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027570 | Country SummaryUnited States  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
C000027570 | Country SummaryUnited Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027570 | Country SummaryMultinational  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027570 | Country SummaryBrazil  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027570 | Country SummaryCanada  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027570 | Country SummaryNetherlands  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027570 | Country SummaryAustralia  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027570 | SectorFunds and Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000027570 | SectorGovernments - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000027570 | SectorInflation-Linked Securities  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000027570 | SectorEmerging Markets - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027570 | SectorOptions on Equity Indices  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027570 | SectorFinancials  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027570 | SectorEnergy  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027570 | SectorWarrants  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027570 | Sector Other Net Line  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%
C000027570 | Asia  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%
C000027567 | Vanguard S&P 500 ETF - ABFR_922908363  
Holdings [Line Items]  
Percent of Net Asset Value 18.90%
C000027567 | iShares Core MSCI Europe ETF - ABFR_46434V738  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027567 | United Kingdom Gilt, 4.75 - ABFR_B24FF0II3  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027567 | iShares Core MSCI Emerging Markets ETF - ABFR_46434G103  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027567 | U.S. Treasury Inflation Index, 0.375 - ABFR_912828V49  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000027567 | Brazil Notas do Tesouro Nacional, 10 - ABFR_ACI2MBMS7  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027567 | U.S. Treasury Inflation Index, 0.5 - ABFR_9128283R9  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000027567 | iShares MSCI Emerging Markets ex China ETF - ABFR_46434G764  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000027567 | Canadian Government Bond, 3.5 - ABFR_135087S70  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027567 | S&P 500 Index - ABFR_ADI3B32S5  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027567 | Country SummaryUnited States  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
C000027567 | Country SummaryUnited Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027567 | Country SummaryMultinational  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027567 | Country SummaryBrazil  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027567 | Country SummaryCanada  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027567 | Country SummaryNetherlands  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027567 | Country SummaryAustralia  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027567 | SectorFunds and Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000027567 | SectorGovernments - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000027567 | SectorInflation-Linked Securities  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000027567 | SectorEmerging Markets - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027567 | SectorOptions on Equity Indices  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027567 | SectorFinancials  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027567 | SectorEnergy  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027567 | SectorWarrants  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027567 | Sector Other Net Line  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%
C000027567 | Asia  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%
C000027569 | Vanguard S&P 500 ETF - ABFR_922908363  
Holdings [Line Items]  
Percent of Net Asset Value 18.90%
C000027569 | iShares Core MSCI Europe ETF - ABFR_46434V738  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027569 | United Kingdom Gilt, 4.75 - ABFR_B24FF0II3  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027569 | iShares Core MSCI Emerging Markets ETF - ABFR_46434G103  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027569 | U.S. Treasury Inflation Index, 0.375 - ABFR_912828V49  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000027569 | Brazil Notas do Tesouro Nacional, 10 - ABFR_ACI2MBMS7  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027569 | U.S. Treasury Inflation Index, 0.5 - ABFR_9128283R9  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000027569 | iShares MSCI Emerging Markets ex China ETF - ABFR_46434G764  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000027569 | Canadian Government Bond, 3.5 - ABFR_135087S70  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027569 | S&P 500 Index - ABFR_ADI3B32S5  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027569 | Country SummaryUnited States  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
C000027569 | Country SummaryUnited Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027569 | Country SummaryMultinational  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027569 | Country SummaryBrazil  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027569 | Country SummaryCanada  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027569 | Country SummaryNetherlands  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027569 | Country SummaryAustralia  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027569 | SectorFunds and Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000027569 | SectorGovernments - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000027569 | SectorInflation-Linked Securities  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000027569 | SectorEmerging Markets - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027569 | SectorOptions on Equity Indices  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027569 | SectorFinancials  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027569 | SectorEnergy  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027569 | SectorWarrants  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027569 | Sector Other Net Line  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%
C000027569 | Asia  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%
C000027573 | Vanguard S&P 500 ETF - ABFR_922908363  
Holdings [Line Items]  
Percent of Net Asset Value 18.90%
C000027573 | iShares Core MSCI Europe ETF - ABFR_46434V738  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027573 | United Kingdom Gilt, 4.75 - ABFR_B24FF0II3  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027573 | iShares Core MSCI Emerging Markets ETF - ABFR_46434G103  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027573 | U.S. Treasury Inflation Index, 0.375 - ABFR_912828V49  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000027573 | Brazil Notas do Tesouro Nacional, 10 - ABFR_ACI2MBMS7  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027573 | U.S. Treasury Inflation Index, 0.5 - ABFR_9128283R9  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000027573 | iShares MSCI Emerging Markets ex China ETF - ABFR_46434G764  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000027573 | Canadian Government Bond, 3.5 - ABFR_135087S70  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027573 | S&P 500 Index - ABFR_ADI3B32S5  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027573 | Country SummaryUnited States  
Holdings [Line Items]  
Percent of Net Asset Value 36.90%
C000027573 | Country SummaryUnited Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000027573 | Country SummaryMultinational  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000027573 | Country SummaryBrazil  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027573 | Country SummaryCanada  
Holdings [Line Items]  
Percent of Net Asset Value 0.80%
C000027573 | Country SummaryNetherlands  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027573 | Country SummaryAustralia  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027573 | SectorFunds and Investment Trusts  
Holdings [Line Items]  
Percent of Net Asset Value 34.60%
C000027573 | SectorGovernments - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000027573 | SectorInflation-Linked Securities  
Holdings [Line Items]  
Percent of Net Asset Value 7.20%
C000027573 | SectorEmerging Markets - Treasuries  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000027573 | SectorOptions on Equity Indices  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000027573 | SectorFinancials  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027573 | SectorEnergy  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027573 | SectorWarrants  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000027573 | Sector Other Net Line  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%
C000027573 | Asia  
Holdings [Line Items]  
Percent of Net Asset Value 47.90%