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Investments (Schedule Of Sources Of Net Investment Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Investment Income [Line Items]      
Gross investment income $ 5,132 $ 3,920 $ 3,643
Investment expenses (195) (178) (187)
Net investment income 4,937 3,742 3,456
Amortization of Debt Issuance Costs and Discounts (21) (41) (84)
Fixed maturities      
Net Investment Income [Line Items]      
Gross investment income 4,619 3,594 3,300
Short-term investments      
Net Investment Income [Line Items]      
Gross investment income 199 81 35
Other interest income      
Net Investment Income [Line Items]      
Gross investment income 69 42 11
Equity securities      
Net Investment Income [Line Items]      
Gross investment income 119 99 150
Private equities      
Net Investment Income [Line Items]      
Gross investment income 55 63 94
Other Investments      
Net Investment Income [Line Items]      
Gross investment income $ 71 $ 41 $ 53