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Fair Value Measurements - Narrative (Details) - Separate Account Assets - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Separate accounts assets classified in Level 3, period increase (decrease), , including transfers in and out of Level 3  
Separate accounts assets classified in Level 3, including disposal groups, period increase (decrease), including transfers in and out of Level 3  
Recurring | Securities partnerships    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Expected liquidation period after inception 10 years