v3.26.3
ORGANIZATION (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Apr. 03, 2025
USD ($)
shares
Apr. 01, 2025
Feb. 24, 2025
USD ($)
$ / shares
shares
Sep. 30, 2026
USD ($)
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
reporting_segment
shares
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Jul. 10, 2025
shares
Jun. 16, 2025
Organization Basis Of Presentation [Line Items]                    
Number of reportable segments | reporting_segment           3        
Loss on novation           $ 13 $ 499      
Increase (decrease) in remeasurement of liability for future policy benefits       $ (15) $ (59) (9) (44)      
Decrease in amounts due from reinsurers           1,027 806      
Assets       $ 334,008   $ 334,008   $ 317,990    
Investment gains (losses), net         1,100   1,100      
RGA Reinsurance Company                    
Organization Basis Of Presentation [Line Items]                    
Percentage of loans receivable, fair value disclosure   75.00%                
Assets         11,600   11,600      
Investment gains (losses), net         1,100   1,100      
Direct insurance liabilities ceded         12,300   12,300      
Ceded reserves related to the non-insulated (“NI”) modco offset by NI modco payable         334   334      
Deferred gain loss on reinsurance         593          
Residual liability closed block         154          
Separate account, liability, ceded         $ 14,100   14,100      
AB Holding                    
Organization Basis Of Presentation [Line Items]                    
Maximum units available to purchase (in shares) | shares 19.7   46.0              
Price per unit (in dollars per share) | $ / shares     $ 38.50              
Aggregate purchase price $ 758   $ 1,800              
Percentage of issued and outstanding units 17.90%                  
Alliance Bernstein                    
Organization Basis Of Presentation [Line Items]                    
Economic interest in Subsidiary       68.00%   68.00%   68.00%    
Available for exchange, shares | shares       4.8   4.8     19.7  
Alliance Bernstein | RGA Reinsurance Company                    
Organization Basis Of Presentation [Line Items]                    
Economic interest in Subsidiary                   70.00%
Novation                    
Organization Basis Of Presentation [Line Items]                    
Loss on novation             499      
Increase in Pre tax AOCI             263      
Total Impact loss             236      
Reduction of purchase MRB asset             2,000      
Reduction of liabilities for MRBs             1,600      
Decrease in reinsurance deposit liability             183      
Increase in policyholders’ account balance             33      
Increase (decrease) in remeasurement of liability for future policy benefits             458      
Decrease in amounts due from reinsurers             $ 432