Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 1,131	$ 901	$ 2,131	$ 1,791
Investment expense	(49)	(44)	(88)	(78)
Investment income, net of related expenses	1,082	857	2,043	1,713
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	881	683	1,641	1,328
Equity securities
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	1	1	3	3
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	97	80	187	154
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	14	13	28	26
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	76	80	165	152
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	44	22	78	43
Partnership Interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	21	19	28	73
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ (3)	$ 3	$ 1	$ 12