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Greater of 6.5% (or 6% or 3%) Roll-up to Age 85 or the Annual Ratchet to Age 85 Enhanced Death Benefit [Member]GMDB - Greater of 6.5% (or 6% or 3%) Roll-up to Age 85 or the Annual Ratchet to Age 85 Enhanced Death Benefit [Member]Guaranteed Minimum Income Benefit (GMIB) [Member]Guaranteed Minimum Income Benefit (GMIB) [Member]1290 VT GAMCO Mergers & Acquisitions Portfolio [Member]1290 VT GAMCO Mergers & Acquisitions Portfolio [Member]1290 VT GAMCO Small Company Value Portfolio [Member]1290 VT GAMCO Small Company Value Portfolio [Member]1290 VT SmartBeta Equity ESG Portfolio [Member]1290 VT SmartBeta Equity ESG Portfolio [Member]1290 VT Socially Responsible Portfolio [Member]1290 VT Socially Responsible Portfolio [Member]EQ/2000 Managed Volatility Portfolio [Member]EQ/2000 Managed Volatility Portfolio [Member]EQ/400 Managed Volatility Portfolio [Member]EQ/400 Managed Volatility Portfolio [Member]EQ/AB Short Duration Government Bond Portfolio [Member]EQ/AB Short Duration Government Bond Portfolio [Member]EQ/AB Small Cap Growth Portfolio [Member]EQ/AB Small Cap Growth Portfolio [Member]EQ/Aggressive Allocation Portfolio [Member]EQ/Aggressive Allocation Portfolio [Member]EQ/Aggressive Growth Strategy Portfolio [Member]EQ/Aggressive Growth Strategy Portfolio [Member]EQ/Balanced Strategy Portfolio [Member]EQ/Balanced Strategy Portfolio [Member]EQ/ClearBridge Select Equity Managed Volatility Portfolio [Member]EQ/ClearBridge Select Equity Managed Volatility Portfolio [Member]EQ/Common Stock Index Portfolio [Member]EQ/Common Stock Index Portfolio [Member]EQ/Conservative Allocation Portfolio [Member]EQ/Conservative Allocation Portfolio [Member]EQ/Conservative-Plus Allocation Portfolio [Member]EQ/Conservative-Plus Allocation Portfolio [Member]EQ/Core Bond Index Portfolio [Member]EQ/Core Bond Index Portfolio [Member]EQ/Equity 500 Index Portfolio [Member]EQ/Equity 500 Index Portfolio [Member]EQ/Franklin Small Cap Value Managed Volatility Portfolio [Member]EQ/Franklin Small Cap Value Managed Volatility Portfolio [Member]EQ/Global Equity Managed Volatility Portfolio [Member]EQ/Global Equity Managed Volatility Portfolio [Member]EQ/Intermediate Government Bond Portfolio [Member]EQ/Intermediate Government Bond Portfolio [Member]EQ/International Core Managed Volatility Portfolio [Member]EQ/International Core Managed Volatility Portfolio [Member]EQ/International Equity Index Portfolio [Member]EQ/International Equity Index Portfolio [Member]EQ/International Value Managed Volatility Portfolio [Member]EQ/International Value Managed Volatility Portfolio [Member]EQ/Janus Enterprise Portfolio [Member]EQ/Janus Enterprise Portfolio [Member]EQ/Large Cap Core Managed Volatility Portfolio [Member]EQ/Large Cap Core Managed Volatility Portfolio [Member]EQ/Large Cap Growth Index Portfolio [Member]EQ/Large Cap Growth Index Portfolio [Member]EQ/Large Cap Growth Managed Volatility Portfolio [Member]EQ/Large Cap Growth Managed Volatility Portfolio [Member]EQ/Large Cap Value Index Portfolio [Member]EQ/Large Cap Value Index Portfolio [Member]EQ/Large Cap Value Managed Volatility Portfolio [Member]EQ/Large Cap Value Managed Volatility Portfolio [Member]EQ/Mid Cap Index Portfolio [Member]EQ/Mid Cap Index Portfolio [Member]EQ/Mid Cap Value Managed Volatility Portfolio [Member]EQ/Mid Cap Value Managed Volatility Portfolio [Member]EQ/Moderate Allocation Portfolio [Member]EQ/Moderate Allocation Portfolio [Member]EQ/Moderate-Plus Allocation Portfolio [Member]EQ/Moderate-Plus Allocation Portfolio [Member]EQ/Money Market Portfolio [Member]EQ/Money Market Portfolio [Member]EQ/Quality Bond PLUS Portfolio [Member]EQ/Quality Bond PLUS Portfolio [Member]EQ/Small Company Index Portfolio [Member]EQ/Small Company Index Portfolio [Member]Multimanager Technology Portfolio [Member]Multimanager Technology Portfolio [Member]