Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pre-tax
Other comprehensive (loss) income	$ (839)	$ (1,057)	$ (227)	$ (4,405)
Tax
Other comprehensive (loss) income	183	224	49	937
After-tax
Other comprehensive loss, after-tax	(656)	(833)	(178)	(3,468)
Unrealized net capital gains and losses
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(974)	(1,161)	(717)	(5,083)
Less: reclassification adjustment of realized capital gains and losses	(121)	(159)	(390)	(602)
Other comprehensive (loss) income	(853)	(1,002)	(327)	(4,481)
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	210	246	152	1,080
Less: reclassification adjustment of realized capital gains and losses	24	33	82	126
Other comprehensive (loss) income	186	213	70	954
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(764)	(915)	(565)	(4,003)
Less: reclassification adjustment of realized capital gains and losses	(97)	(126)	(308)	(476)
Other comprehensive loss, after-tax	(667)	(789)	(257)	(3,527)
Unrealized foreign currency translation adjustments
Pre-tax
Other comprehensive (loss) income	(18)	(112)	81	(171)
Tax
Other comprehensive (loss) income	4	24	(17)	36
After-tax
Other comprehensive loss, after-tax	(14)	(88)	64	(135)
Unamortized pension and other postretirement prior service credit
Pre-tax
Other comprehensive (loss) income	(6)	(9)	(18)	(47)
Tax
Other comprehensive (loss) income	1	1	4	9
After-tax
Other comprehensive loss, after-tax	(5)	(8)	(14)	(38)
Discount rate for reserve for future policy benefits
Pre-tax
Other comprehensive (loss) income	38	66	37	294
Tax
Other comprehensive (loss) income	(8)	(14)	(8)	(62)
After-tax
Other comprehensive loss, after-tax	$ 30	$ 52	$ 29	$ 232