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Investments, Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Investment Income [Abstract]    
Investment income $ 570 $ 184
Investment expenses (20) (21)
Net investment income 550 163
Net unrealized gains (losses) on securities 32 (117)
Fixed Maturity Securities [Member]    
Net Investment Income [Abstract]    
Investment income 428 438
Limited Partnership Investments [Member]    
Net Investment Income [Abstract]    
Investment income 47 (102)
Short Term Investments [Member]    
Net Investment Income [Abstract]    
Investment income   7
Equity Securities [Member]    
Net Investment Income [Abstract]    
Investment income 29 (44)
Income (Loss) from Trading Portfolio [Member]    
Net Investment Income [Abstract]    
Investment income [1] 50 (129)
Other [Member]    
Net Investment Income [Abstract]    
Investment income $ 16 $ 14
[1] Net unrealized gains (losses) related to changes in fair value on securities still held were $32 and $(117) for the three months ended March 31, 2021 and 2020.