Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 1,927	$ 1,465	$ 3,694	$ 2,749
Investment expense	(63)	(57)	(129)	(109)
Investment income, net of related expenses	1,864	1,408	3,565	2,640
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	1,442	1,109	2,811	2,172
Equity securities
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	4	1	8	3
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	164	128	321	247
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	44	12	87	30
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	86	68	194	134
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	34	45	67	81
Partnership Interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	150	103	204	88
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 3	$ (1)	$ 2	$ (6)