Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 800	$ 826	$ 2,423	$ 2,447
Investment expense	(31)	(30)	(90)	(80)
Investment income, net of related expenses	769	796	2,333	2,367
Limited Partner [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	43	96	281	327
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	591	519	1,683	1,530
Equity securities
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	2	1	5	4
Mortgage Loans on Real Estate [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	74	81	223	220
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	13	14	40	41
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	67	100	175	279
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	7	1	11	2
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 3	$ 14	$ 5	$ 44