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Adoption of Long-Duration Targeted Improvements - Narrative (Details)
$ in Billions
Jul. 01, 2021
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Gross reserves balance, fully reinsured $ 1.1
Reported  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Gross reserves balance, fully reinsured $ 0.9