Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) on a Pre-Tax and After-Tax Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pre-tax
Other comprehensive income (loss)	$ 485	$ (233)
Tax
Other comprehensive income (loss)	(105)	50
After-tax
Other comprehensive income (loss), after-tax	380	(183)
Unrealized net capital gains and losses
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	389	(375)
Less: reclassification adjustment of realized capital gains and losses	(147)	(101)
Other comprehensive income (loss)	536	(274)
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(85)	80
Less: reclassification adjustment of realized capital gains and losses	31	21
Other comprehensive income (loss)	(116)	59
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	304	(295)
Less: reclassification adjustment of realized capital gains and losses	(116)	(80)
Other comprehensive income (loss), after-tax	420	(215)
Unrealized foreign currency translation adjustments
Pre-tax
Other comprehensive income (loss)	(57)	10
Tax
Other comprehensive income (loss)	12	(2)
After-tax
Other comprehensive income (loss), after-tax	(45)	8
Unamortized pension and other postretirement prior service credit
Pre-tax
Other comprehensive income (loss)	0	(1)
Tax
Other comprehensive income (loss)	0	0
After-tax
Other comprehensive income (loss), after-tax	0	(1)
Discount rate for reserve for future policy benefits
Pre-tax
Other comprehensive income (loss)	6	32
Tax
Other comprehensive income (loss)	(1)	(7)
After-tax
Other comprehensive income (loss), after-tax	$ 5	$ 25