Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 2,002	$ 1,531	$ 5,696	$ 4,280
Investment expense	(68)	(56)	(197)	(165)
Investment income, net of related expenses	1,934	1,475	5,499	4,115
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	1,498	1,221	4,309	3,393
Equity securities
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	7	2	15	5
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	175	144	496	391
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	42	44	129	74
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	99	81	293	215
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	33	42	100	123
Partnership Interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	146	0	350	88
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 2	$ (3)	$ 4	$ (9)