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Investments - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 01, 2023
USD ($)
Jun. 30, 2023
USD ($)
Security
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Security
manager
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Security
Schedule of Investments [Line Items]            
Number of outside managers managing investment portfolio | manager       3    
Accrued investment income   $ 73   $ 73   $ 71
Number of securities with unrealized losses greater than 10% of book value for 12 months or more | Security   508   508   567
Total unrealized losses for securities having losses greater than 10% of book value for 12 months or more   $ 269   $ 269   $ 329
Assets held-in-trust   230   230   222
Allowance for credit loss   (10) $ (4) (15) $ (9)  
Sales   239 $ 296 694 $ 353  
Subsequent Event | Disposal Group, Held-for-sale, Not Discontinued Operations | Sound Point Agreement            
Schedule of Investments [Line Items]            
Transaction commitment, new and transitioned investments $ 1,000          
AGL Subsidiaries            
Schedule of Investments [Line Items]            
Assets held-in-trust   1,149   1,149   $ 1,169
Future Equity Investments | Alternative Investment            
Schedule of Investments [Line Items]            
Investments, including distributed gains, authorized amount to invest   114   114    
Investments, fair value disclosure   510   510    
Future Equity Investments | Alternative Investment | Subsequent Event            
Schedule of Investments [Line Items]            
Investments, authorized amount to invest 1,500          
Unfunded committment 991          
Future Equity Investments | AGL Subsidiaries | Alternative Investment            
Schedule of Investments [Line Items]            
Investments, authorized amount to invest   864   864    
Authorized amount to invest, excluding distributed gains   $ 750   $ 750    
Equity in Earnings (Losses) of Investees | AGAS | Alternative Investment | Subsequent Event            
Schedule of Investments [Line Items]            
Investments, fair value disclosure 350          
Long-term purchase commitment, amount 553          
Investments, Funded Amount $ 333