Investments - Schedule of Change in Unrealized Net Capital Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Total	$ (192)	$ 2,096	$ (3,643)
Amounts recognized for:
Reclassification of noncontrolling interest	(10)	(10)	19
Deferred income taxes	35	(435)	771
(Decrease) increase in unrealized net capital gains and losses, after-tax	(167)	1,651	(2,853)
Limited partnerships interests
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Total	4	(6)	3
Investments classified as held for sale
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Total	(110)	0	0
Fixed income securities
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Total	(85)	2,101	(3,645)
Short-term investments
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Total	(1)	0	(1)
Derivative instruments
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
Total	$ 0	$ 1	$ 0