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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pre-tax
Other comprehensive income (loss)	$ 1,642	$ (839)	$ 1,226	$ (227)
Tax
Other comprehensive income (loss)	(365)	183	(275)	49
After-tax
Other comprehensive income (loss), after-tax	1,277	(656)	951	(178)
Unrealized net capital gains and losses
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	1,753	(974)	1,118	(717)
Less: reclassification adjustment of realized capital gains and losses	83	(121)	(126)	(390)
Other comprehensive income (loss)	1,670	(853)	1,244	(327)
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(388)	210	(253)	152
Less: reclassification adjustment of realized capital gains and losses	(17)	24	26	82
Other comprehensive income (loss)	(371)	186	(279)	70
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	1,365	(764)	865	(565)
Less: reclassification adjustment of realized capital gains and losses	66	(97)	(100)	(308)
Other comprehensive income (loss), after-tax	1,299	(667)	965	(257)
Unrealized foreign currency translation adjustments
Pre-tax
Other comprehensive income (loss)	18	(18)	(1)	81
Tax
Other comprehensive income (loss)	(4)	4	0	(17)
After-tax
Other comprehensive income (loss), after-tax	14	(14)	(1)	64
Unamortized pension and other postretirement prior service credit
Pre-tax
Other comprehensive income (loss)	0	(6)	(2)	(18)
Tax
Other comprehensive income (loss)	0	1	1	4
After-tax
Other comprehensive income (loss), after-tax	0	(5)	(1)	(14)
Discount rate for reserve for future policy benefits
Pre-tax
Other comprehensive income (loss)	(46)	38	(15)	37
Tax
Other comprehensive income (loss)	10	(8)	3	(8)
After-tax
Other comprehensive income (loss), after-tax	$ (36)	$ 30	$ (12)	$ 29