Segment Information - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Net realized gains, adjusted revenues	$ (2,536)	$ (195)	$ 1,705
Net realized gains, adjusted net investment income	(227)	(244)	(156)
Net realized gains, adjusted interest expense		(1)	(13)
Net realized gains, adjusted pre-tax income (loss)	(2,496)	(173)	$ 1,744
Net impact from elimination of international reporting lag, adjusted revenues	4	978
Net impact from elimination of international reporting lag, net investment income	1	41
Net impact from elimination of international reporting lag, adjusted pre-tax income (loss)	$ 12	$ 127
General Insurance
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Life and Retirement
Segment Reporting Information [Line Items]
Number of operating segments | segment	4