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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
May 09, 2022
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   $ 69,800,000,000 $ 71,800,000,000    
Due from reinsurers (as a percent)   5.00%      
Bilateral letters of credit outstanding         $ 125,000,000
Secured | Reinsurer Concentration Risk [Member]          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   $ 46,300,000,000 48,400,000,000    
Unsecured | Reinsurer Concentration Risk [Member]          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   3,200,000,000 3,600,000,000    
Long-Duration Insurance          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   $ 1,100,000,000 $ 900,000,000 $ 1,300,000,000  
Assumed ratio on life insurance (as a percent)   0.01% 0.01% 0.01%  
Premiums on life insurance (as a percent)   46.60% 21.80% 33.00%  
Short-Duration Insurance          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   $ 8,100,000,000 $ 7,100,000,000 $ 7,200,000,000  
Ceded loss reserves   12,400,000,000 14,300,000,000    
Deferred gain liability   585,000,000 661,000,000    
Amortization of deferred gain   $ 82,000,000 $ 252,000,000 $ 191,000,000  
Short-Duration Insurance | NICO          
Effects of Reinsurance [Line Items]          
Reserve risk (as a percent) 80.00%        
Insurance contract losses $ 25,000,000,000        
Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverable (as a percent)   90.00% 92.00%    
Non-Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverable (as a percent)   9.00% 7.00%    
Non-Investment Grade | Captive Insurers          
Effects of Reinsurance [Line Items]          
Reinsurance recoverable (as a percent)   83.00% 77.00%    
Not Rated          
Effects of Reinsurance [Line Items]          
Reinsurance recoverable (as a percent)   1.00% 1.00%    
Legacy Life And Retirement Run Off Lines Segment Member          
Effects of Reinsurance [Line Items]          
Ceded reserves   $ 27,600,000,000      
Legacy General Insurance Run Off Lines Member          
Effects of Reinsurance [Line Items]          
Ceded reserves   $ 3,000,000,000      
General Insurance | Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverable (as a percent)   51.00% 53.00%    
Life and Retirement | Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverable (as a percent)   39.00% 39.00%    
Life and Retirement | Non-Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverable (as a percent)     1.00%