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Investments, Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Investment Income [Abstract]        
Investment income $ 662 $ 569 $ 846 $ 1,245
Investment expenses (18) (18) (39) (37)
Net investment income 644 551 807 1,208
Net unrealized gains (losses) on securities 80 8 7 48
Fixed Maturity Securities [Member]        
Net Investment Income [Abstract]        
Investment income 430 455 868 910
Limited Partnership Investments [Member]        
Net Investment Income [Abstract]        
Investment income 57 43 (45) 124
Short Term Investments [Member]        
Net Investment Income [Abstract]        
Investment income 2 14 9 29
Equity Securities [Member]        
Net Investment Income [Abstract]        
Investment income 50 16 6 46
Income (Loss) from Trading Portfolio [Member]        
Net Investment Income [Abstract]        
Investment income [1] 107 29 (22) 110
Other [Member]        
Net Investment Income [Abstract]        
Investment income $ 16 $ 12 $ 30 $ 26
[1] Net unrealized gains (losses) related to changes in fair value on securities still held were $80 and $8 for the three months ended June 30, 2020 and 2019 and $7 and $48 for the six months ended June 30, 2020 and 2019.