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REINSURANCE - Ceded Reinsurance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Estimated net fair values of ceded GMIB reinsurance contracts, considered derivatives $ 1,229 $ 1,848  
Estimated net fair values of ceded GMIB NLG ceded reserves to Venerable 4,114 5,813  
Third-party reinsurance recoverables related to insurance contracts [1] 17,201 14,679  
Amount due to reinsurers 1,533 1,381  
Increase (decrease) in the fair value of the reinsurance contracts (619) (640) $ 349
Group Life And Health Insurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance recoverables related to insurance contracts 47 40  
Reinsurance assumed reserves 662 798  
Venerable Insurance and Annuity Company (A- KBRA (IFRS) rating) | A -      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance recoverables related to insurance contracts 8,966 10,291  
First Allmerica-GAF      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Amount due to reinsurers 147 0  
First Allmerica-GAF | Global Assessment Of Functioning Scale      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance recoverables related to insurance contracts 4,005    
RGA Reinsurance Company      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Amount due to reinsurers 1,171 1,212  
RGA Reinsurance Company | AA-      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance recoverables related to insurance contracts 1,272 1,138  
Zurich Life Insurance Company, Ltd. | AA-      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Reinsurance recoverables related to insurance contracts 1,181 1,318  
Protective Life Insurance Company      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Amount due to reinsurers $ 104 $ 111  
[1] Represents the fair value of the ceded reserves to Venerable. See Note 1 of the Notes to these Consolidated Financial Statements for details of the Venerable Transaction and Note 8 of the Notes to these Consolidated Financial Statements.