Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pre-tax
Other comprehensive (loss) income	$ (233)	$ 913
Tax
Other comprehensive (loss) income	50	(194)
After-tax
Other comprehensive (loss) income, after-tax	(183)	719
Unrealized net capital gains and losses
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(375)	729
Less: reclassification adjustment of realized capital gains and losses	(101)	(138)
Other comprehensive (loss) income	(274)	867
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	80	(156)
Less: reclassification adjustment of realized capital gains and losses	21	29
Other comprehensive (loss) income	59	(185)
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(295)	573
Less: reclassification adjustment of realized capital gains and losses	(80)	(109)
Other comprehensive (loss) income, after-tax	(215)	682
Unrealized foreign currency translation adjustments
Pre-tax
Other comprehensive (loss) income	10	63
Tax
Other comprehensive (loss) income	(2)	(13)
After-tax
Other comprehensive (loss) income, after-tax	8	50
Unamortized pension and other postretirement prior service credit
Pre-tax
Other comprehensive (loss) income	(1)	(6)
Tax
Other comprehensive (loss) income	0	2
After-tax
Other comprehensive (loss) income, after-tax	(1)	(4)
Discount rate for reserve for future policy benefits
Pre-tax
Other comprehensive (loss) income	32	(11)
Tax
Other comprehensive (loss) income	(7)	2
After-tax
Other comprehensive (loss) income, after-tax	$ 25	$ (9)