Net Investment Income and Investment Related Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net Investment Income [Line Items]
Total net investment income	$ 924	$ 342	$ 1,372	$ 666
Total investment related gains (losses), net	2	41	(32)	(20)
Available-for-sale fixed maturity securities
Net Investment Income [Line Items]
Total net investment income	433	167	661	324
Total investment related gains (losses), net	(33)	(35)	(25)	(60)
Equity securities
Net Investment Income [Line Items]
Total net investment income	6	0	21	0
Total investment related gains (losses), net	35	71	24	43
Mortgage loans
Net Investment Income [Line Items]
Total net investment income	160	73	238	142
Total investment related gains (losses), net	2	2	(6)	(10)
Private loans
Net Investment Income [Line Items]
Total net investment income	1	0	1	0
Total investment related gains (losses), net	(3)	0	(3)	0
Real estate
Net Investment Income [Line Items]
Total net investment income	39	1	52	5
Real estate partnerships
Net Investment Income [Line Items]
Total net investment income	6	(1)	6	15
Investment funds
Net Investment Income [Line Items]
Total net investment income	133	31	168	50
Policy loans
Net Investment Income [Line Items]
Total net investment income	6	0	6	0
Short-term investments
Net Investment Income [Line Items]
Total net investment income	45	58	77	92
Other
Net Investment Income [Line Items]
Total net investment income	95	13	142	38
Short-term investments and other invested assets
Net Investment Income [Line Items]
Total investment related gains (losses), net	$ 1	$ 3	$ (22)	$ 7