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Schedule of Target Assets Allocation (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2024
Bloomberg U.S. Corporate A or Better Index, 20+ Year Index | U.S. corporate fixed income |
Defined Benefit Plan Disclosure [Line Items] |
Policy index period description | 20+ Year
Bloomberg U.S. 3 - 10 Year Treasury Bond Index | U.S. government fixed income | Minimum |
Defined Benefit Plan Disclosure [Line Items] |
Policy index duration period | 3 years
Bloomberg U.S. 3 - 10 Year Treasury Bond Index | U.S. government fixed income | Maximum |
Defined Benefit Plan Disclosure [Line Items] |
Policy index duration period | 10 years
ICE BofA 3-Month Treasury Bill Index | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Policy index duration period | 3 months

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