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Reinsurance - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Jul. 01, 2020
MassMutual      
Effects of Reinsurance [Line Items]      
Funds withheld at interest     $ 5,021
Protective      
Effects of Reinsurance [Line Items]      
Assets held-in-trust $ 1,203 $ 1,624  
Minimum      
Effects of Reinsurance [Line Items]      
Assets held-in-trust 12,643 6,380  
Minimum | Global Atlantic      
Effects of Reinsurance [Line Items]      
Assets held-in-trust $ 2,745 $ 2,854