Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pre-tax
Other comprehensive (loss) income	$ (183)	$ (301)	$ (416)	$ 612
Tax
Other comprehensive (loss) income	40	60	90	(134)
After-tax
Other comprehensive (loss) income, after-tax	(143)	(241)	(326)	478
Unrealized net capital gains and losses
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(260)	(472)	(635)	257
Less: reclassification adjustment of realized capital gains and losses	(108)	(131)	(209)	(269)
Other comprehensive (loss) income	(152)	(341)	(426)	526
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	56	96	136	(60)
Less: reclassification adjustment of realized capital gains and losses	23	27	44	56
Other comprehensive (loss) income	33	69	92	(116)
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(204)	(376)	(499)	197
Less: reclassification adjustment of realized capital gains and losses	(85)	(104)	(165)	(213)
Other comprehensive (loss) income, after-tax	(119)	(272)	(334)	410
Unrealized foreign currency translation adjustments
Pre-tax
Other comprehensive (loss) income	(29)	36	(19)	99
Tax
Other comprehensive (loss) income	6	(8)	4	(21)
After-tax
Other comprehensive (loss) income, after-tax	(23)	28	(15)	78
Unamortized pension and other postretirement prior service credit
Pre-tax
Other comprehensive (loss) income	(1)	(6)	(2)	(12)
Tax
Other comprehensive (loss) income	1	1	1	3
After-tax
Other comprehensive (loss) income, after-tax	0	(5)	(1)	(9)
Discount rate for reserve for future policy benefits
Pre-tax
Other comprehensive (loss) income	(1)	10	31	(1)
Tax
Other comprehensive (loss) income	0	(2)	(7)	0
After-tax
Other comprehensive (loss) income, after-tax	$ (1)	$ 8	$ 24	$ (1)