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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pre-tax
Other comprehensive income (loss)	$ 454	$ 1,642	$ 1,514	$ 1,226
Tax
Other comprehensive income (loss)	(99)	(365)	(327)	(275)
After-tax
Other comprehensive income, after-tax	355	1,277	1,187	951
Unrealized net capital gains and losses
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	482	1,753	1,049	1,118
Less: reclassification adjustment of realized capital gains and losses	79	83	(383)	(126)
Other comprehensive income (loss)	403	1,670	1,432	1,244
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(105)	(388)	(230)	(253)
Less: reclassification adjustment of realized capital gains and losses	(17)	(17)	80	26
Other comprehensive income (loss)	(88)	(371)	(310)	(279)
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	377	1,365	819	865
Less: reclassification adjustment of realized capital gains and losses	62	66	(303)	(100)
Other comprehensive income, after-tax	315	1,299	1,122	965
Unrealized foreign currency translation adjustments
Pre-tax
Other comprehensive income (loss)	51	18	100	(1)
Tax
Other comprehensive income (loss)	(11)	(4)	(21)	0
After-tax
Other comprehensive income, after-tax	40	14	79	(1)
Unamortized pension and other postretirement prior service credit
Pre-tax
Other comprehensive income (loss)	(1)	0	(1)	(2)
Tax
Other comprehensive income (loss)	0	0	0	1
After-tax
Other comprehensive income, after-tax	(1)	0	(1)	(1)
Discount rate for reserve for future policy benefits
Pre-tax
Other comprehensive income (loss)	1	(46)	(17)	(15)
Tax
Other comprehensive income (loss)	0	10	4	3
After-tax
Other comprehensive income, after-tax	$ 1	$ (36)	$ (13)	$ (12)