v3.26.1
ORGANIZATION (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Apr. 03, 2025
USD ($)
shares
Apr. 01, 2025
Feb. 24, 2025
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
reporting_segment
shares
Sep. 30, 2025
USD ($)
Mar. 31, 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       (9)   2      
Decrease in amounts due from reinsurers       768   307      
Assets       $ 310,382     $ 317,990    
RGA Reinsurance Company                  
Organization Basis Of Presentation [Line Items]                  
Percentage of loans receivable, fair value disclosure   75.00%              
Assets         $ 11,600        
Investment gains (losses), net         1,100        
Direct insurance liabilities ceded         12,300        
Ceded reserves related to the non-insulated (“NI”) modco offset by NI modco payable         334        
Deferred gain loss on reinsurance         593        
Residual liability closed block         154        
Separate account, liability, ceded         $ 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%    
Available for exchange, shares | shares       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