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Net Investment Income and Investment Related Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Investment Income [Line Items]
Total net investment income	$ 1,024	$ 375	$ 2,396	$ 1,020
Total investment related gains (losses), net	(128)	(12)	(160)	(32)
Available-for-sale fixed maturity securities
Net Investment Income [Line Items]
Total net investment income	604	177	1,265	501
Total investment related gains (losses), net	(100)	13	(125)	(47)
Equity securities
Net Investment Income [Line Items]
Total net investment income	17	4	38	4
Total investment related gains (losses), net	23	(10)	47	33
Mortgage loans
Net Investment Income [Line Items]
Total net investment income	190	80	428	222
Total investment related gains (losses), net	(22)	1	(28)	(9)
Private loans
Net Investment Income [Line Items]
Total net investment income	24	0	25	0
Total investment related gains (losses), net	0	(12)	(3)	(12)
Real estate
Net Investment Income [Line Items]
Total net investment income	(6)	2	46	7
Real estate partnerships
Net Investment Income [Line Items]
Total net investment income	(3)	1	3	16
Investment funds
Net Investment Income [Line Items]
Total net investment income	55	53	223	103
Policy loans
Net Investment Income [Line Items]
Total net investment income	6	0	12	0
Short-term investments
Net Investment Income [Line Items]
Total net investment income	63	46	140	138
Other
Net Investment Income [Line Items]
Total net investment income	74	12	216	29
Short-term investments and other invested assets
Net Investment Income [Line Items]
Total investment related gains (losses), net	$ (29)	$ (4)	$ (51)	$ 3

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