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Components of Net Realized Investment Gains (Losses) (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Interest Rate Swap
Schedule Of Available For Sale Securities [Line Items]
Net interest settlements	$ 3.0

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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