Investments (Schedule Of Sources Of Net Investment Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Investment Income [Line Items]
Gross investment income	$ 6,136	$ 5,132	$ 3,920
Investment expenses	(206)	(195)	(178)
Net investment income	5,930	4,937	3,742
Amortization of Debt Issuance Costs and Discounts	(16)	(21)	(41)
Fixed maturities
Net Investment Income [Line Items]
Gross investment income	5,535	4,619	3,594
Short-term investments
Net Investment Income [Line Items]
Gross investment income	181	199	81
Other interest income
Net Investment Income [Line Items]
Gross investment income	80	69	42
Equity securities
Net Investment Income [Line Items]
Gross investment income	125	119	99
Private equities
Net Investment Income [Line Items]
Gross investment income	112	55	63
Other Investments
Net Investment Income [Line Items]
Gross investment income	$ 103	$ 71	$ 41