Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 901	$ 786	$ 1,791	$ 1,623
Investment expense	(44)	(32)	(78)	(59)
Investment income, net of related expenses	857	754	1,713	1,564
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	683	559	1,328	1,092
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	80	76	154	149
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	13	14	26	27
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	80	57	152	108
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	22	2	43	4
Partnership Interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	19	77	73	238
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 3	$ 0	$ 12	$ 2