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REINSURANCE - Ceded Reinsurance (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Estimated net fair values of purchased market risk benefits $ 10,676 $ 10,423
Third-party reinsurance recoverables related to insurance contracts [1] 8,453 8,471
Amount due to reinsurers 1,428 1,533
Amount due to reinsurers 1,428 1,533
Group Life And Health Insurance    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Reinsurance recoverables related to insurance contracts 48 47
Reinsurance assumed reserves 694 701
First Allmerica-GAF    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Reinsurance recoverables related to insurance contracts 3,933 4,005
Amount due to reinsurers 71 147
Zurich Life Insurance Company, Ltd.    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Reinsurance recoverables related to insurance contracts 1,401 1,416
RGA Reinsurance Company    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Reinsurance recoverables related to insurance contracts 1,301 1,272
Amount due to reinsurers 1,175 1,171
Protective Life Insurance Company    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Amount due to reinsurers $ 103 $ 104
[1] Represents the fair value of the ceded reserves to Venerable. See Note 1 of the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 for details of the Venerable Transaction and Note 7 of the Notes to these Consolidated Financial Statements.