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Investments - Limited Partnerships (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Position
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Limited Partners' Capital Account, Value [Abstract]      
Limited partnership investments $ 2,174 $ 1,954  
Net undistributed earnings of limited partnerships $ 250 $ 183  
Percentage of carrying value of investments in limited partnerships reported on current basis 17.00%    
Percentage of carrying value of investments in limited partnerships reported on one month lag 4.00%    
Threshold for number of largest limited partnership positions held | Position 10    
Carrying value of limited partnerships as a percentage of aggregate partnership equity 1.00% 1.00%  
Income from limited partnerships as a percentage of changes in aggregate partnership equity 1.00% 2.00% 2.00%
Advance written notice period for hedge fund withdrawals 90 days    
Minimum      
Limited Partners' Capital Account, Value [Abstract]      
Liquidity period under hedge fund withdrawal provisions 30 days    
Maximum      
Limited Partners' Capital Account, Value [Abstract]      
Liquidity period under hedge fund withdrawal provisions 1 year    
Private Debt and Equity      
Limited Partners' Capital Account, Value [Abstract]      
Percentage of carrying value of investments in limited partnerships 85.00% 75.00%  
Hedge Funds      
Limited Partners' Capital Account, Value [Abstract]      
Percentage of carrying value of investments in limited partnerships 15.00% 25.00%  
Ten Largest Limited Partnership Holdings      
Limited Partners' Capital Account, Value [Abstract]      
Limited partnership investments $ 622 $ 633