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Investments, Limited Partnerships (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Position
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Limited Partnerships [Abstract]      
Limited partnership investments $ 1,798 $ 2,004  
Net undistributed earnings of limited partnerships $ 252 $ 297  
Percentage of carrying value of investments in limited partnerships reported on current basis 54.00%    
Percentage of carrying value of investments in limited partnerships reported on one month lag 9.00%    
Threshold for number of largest limited partnership positions held | Position 10    
Carrying value of limited partnerships as a percentage of aggregate partnership equity 2.00% 2.00%  
Income from limited partnerships as a percentage of changes in aggregate partnership equity 2.00% 2.00% 3.00%
Advance written notice period for hedge fund withdrawals 90 days    
Minimum [Member]      
Limited Partnerships [Abstract]      
Liquidity period under hedge fund withdrawal provisions 30 days    
Maximum [Member]      
Limited Partnerships [Abstract]      
Liquidity period under hedge fund withdrawal provisions 1 year    
Hedge Funds [Member]      
Limited Partnerships [Abstract]      
Percentage of carrying value of investments in limited partnerships 56.00% 66.00%  
Hedge Funds, Equity Related [Member]      
Limited Partnerships [Abstract]      
Percentage of carrying value of investments in limited partnerships 46.00%    
Hedge Funds, Multi-Strategy Approach Hedge Funds [Member]      
Limited Partnerships [Abstract]      
Percentage of carrying value of investments in limited partnerships 36.00%    
Hedge Funds, Distressed Investments [Member]      
Limited Partnerships [Abstract]      
Percentage of carrying value of investments in limited partnerships 11.00%    
Hedge Funds, Fixed Income [Member]      
Limited Partnerships [Abstract]      
Percentage of carrying value of investments in limited partnerships 7.00%    
Private Debt and Equity [Member]      
Limited Partnerships [Abstract]      
Percentage of carrying value of investments in limited partnerships 36.00% 29.00%  
Ten Largest Limited Partnership Holdings [Member]      
Limited Partnerships [Abstract]      
Limited partnership investments $ 914 $ 1,100