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Fair Value Measurements - Assets and Liabilities Measured at Fair Value under Certain Conditions (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Realized investment losses on assets measured at fair value under certain conditions, after-tax
Realized investment gains on equity securities with no readily determinable fair value