Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 786	$ 785	$ 1,623	$ 1,621
Investment expense	(32)	(26)	(59)	(50)
Investment income, net of related expenses	754	759	1,564	1,571
Limited Partner [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	77	70	238	231
Available-for-sale Securities [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	559	516	1,092	1,011
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	76	73	149	139
Policy loans
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	14	13	27	27
Funds withheld at interest
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	57	95	108	179
Short-term Investments [Member]
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	2	0	4	1
Other invested assets
Major Categories Of Investment Income Net of Expenses [Line Items]
Investment revenue	$ 0	$ 17	$ 2	$ 30