Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pre-tax
Other comprehensive (loss) income	$ (230)	$ 2,138	$ (3,579)
Tax
Other comprehensive (loss) income	41	(446)	761
After-tax
Other comprehensive (loss) income, after-tax	(189)	1,692	(2,818)
Unrealized net capital gains and losses
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(495)	1,547	(4,472)
Less: reclassification adjustment of realized capital gains and losses	(293)	(539)	(848)
Other comprehensive (loss) income	(202)	2,086	(3,624)
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	97	(322)	949
Less: reclassification adjustment of realized capital gains and losses	62	113	178
Other comprehensive (loss) income	35	(435)	771
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(398)	1,225	(3,523)
Less: reclassification adjustment of realized capital gains and losses	(231)	(426)	(670)
Other comprehensive (loss) income, after-tax	(167)	1,651	(2,853)
Unrealized foreign currency translation adjustments
Pre-tax
Other comprehensive (loss) income	(59)	85	(190)
Tax
Other comprehensive (loss) income	12	(18)	40
After-tax
Other comprehensive (loss) income, after-tax	(47)	67	(150)
Unamortized pension and other postretirement prior service credit
Pre-tax
Other comprehensive (loss) income	(3)	(20)	(54)
Tax
Other comprehensive (loss) income	1	4	11
After-tax
Other comprehensive (loss) income, after-tax	(2)	(16)	(43)
Discount rate for reserve for future policy benefits
Pre-tax
Other comprehensive (loss) income	34	(13)	289
Tax
Other comprehensive (loss) income	(7)	3	(61)
After-tax
Other comprehensive (loss) income, after-tax	$ 27	$ (10)	$ 228