Managed Volatility Balanced Portfolio Average Annual Total Returns		12 Months Ended	60 Months Ended	120 Months Ended
		Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2024
S&P 500 Index (reflects no deduction for fees, expenses, or taxes)[Member]
Prospectus [Line Items]
Average Annual Return, Percent		25.02%	14.53%	13.10%
Morningstar U.S. Moderate Target Allocation Index (reflects no deduction for fees, expenses, or taxes)[Member]
Prospectus [Line Items]
Average Annual Return, Percent		12.96%	7.47%	7.45%
John Hancock Lifestyle Balanced Index (reflects no deduction for fees, expenses, or taxes, except foreign withholding taxes on dividends)[Member]
Prospectus [Line Items]
Average Annual Return, Percent	[1]	9.41%	6.03%	6.66%
Series I
Prospectus [Line Items]
Average Annual Return, Percent		9.36%	3.05%	4.30%
Series II
Prospectus [Line Items]
Average Annual Return, Percent		9.13%	2.85%	4.10%
NAV
Prospectus [Line Items]
Average Annual Return, Percent		9.37%	3.09%	4.36%

[1] Prior to July 1, 2026, the fund’s additional benchmark was the 35% Russell 3000 Index/15% MSCI EAFE Index/50% Bloomberg U.S. Aggregate Bond Index. Effective July 1, 2026, the fund’s additional benchmark is the John Hancock Lifestyle Balanced Index. The John Hancock Lifestyle Balanced Index better reflects the universe of investment opportunities based on the fund’s investment strategy. As of January 1, 2025, the John Hancock Lifestyle Balanced Index comprises 31.5% of the S&P 500 Index, 12.3% of the MSCI World ex-USA Index, 8.4% of the Russell 2500 Index, 4.8% of the MSCI Emerging Markets Index, 3.0% of the John Hancock Real Asset Blended Index, 3.0% of the ICE BofA U.S. High Yield Index, 3.0% of the JPMorgan EMBI Global Index, 3.0% of the S&P/LSTA Leveraged Loan Index, 24.0% of the Bloomberg U.S. Aggregate Bond Index, 3.0% of the ICE BofA Long U.S. STRIPS Index, and 4.0% of the Bloomberg 1-5 Year TIPS Index.