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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
May 09, 2022
Effects of Reinsurance [Line Items]          
Reinsurance asset, allowance for credit loss   $ 295,000,000 $ 333,000,000    
Reinsurance recoverables   $ 73,700,000,000 76,300,000,000    
Premiums on life insurance (as a percent)   1.30%      
Bilateral letters of credit outstanding         $ 175,000,000
Due from reinsurers (as a percent)   5.00%      
Reinsurer Concentration Risk [Member] | Secured          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   $ 48,400,000,000 51,500,000,000    
Reinsurer Concentration Risk [Member] | Unsecured          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   3,600,000,000 $ 3,100,000,000    
Legacy Life And Retirement Run Off Lines Segment Member          
Effects of Reinsurance [Line Items]          
Ceded reserves   29,000,000,000      
Legacy General Insurance Run Off Lines Member          
Effects of Reinsurance [Line Items]          
Ceded reserves   $ 3,200,000,000      
Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables, percent   92.00% 92.00%    
Investment Grade | General Insurance          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables, percent   53.00% 52.00%    
Investment Grade | Life and Retirement          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables, percent   39.00% 40.00%    
Non-Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables, percent   7.00% 7.00%    
Non-Investment Grade | Life and Retirement          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables, percent   1.00% 1.00%    
Not Rated          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables, percent   1.00% 1.00%    
Short-Duration Insurance          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   $ 7,100,000,000 $ 7,200,000,000 $ 7,700,000,000  
Ceded loss reserves   14,300,000,000 16,800,000,000    
Deferred gain liability   661,000,000 1,300,000,000    
Amortization of deferred gain   252,000,000 191,000,000 237,000,000  
Short-Duration Insurance | NICO          
Effects of Reinsurance [Line Items]          
Reserve risk (as a percent) 80.00%        
Insurance contract losses $ 25,000,000,000        
Long-Duration Insurance          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables   $ 900,000,000 $ 1,300,000,000 $ 1,100,000,000  
Assumed ratio on life insurance (as a percent)   0.01% 0.01% 0.02%  
Premiums on life insurance (as a percent)   21.80% 33.00% 19.50%  
Captive Insurers | Non-Investment Grade          
Effects of Reinsurance [Line Items]          
Reinsurance recoverables, percent   77.00% 71.00%    
Excluding Fortitude          
Effects of Reinsurance [Line Items]          
Reinsurance asset, allowance for credit loss   $ 295,000,000