Segment Information - Reconciliation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total revenues	$ (322)	$ (764)
Net gains (losses) on derivatives and investments	2,892	2,726
Net investment income on funds withheld assets	270	307
Corporate And Reconciling Items
Segment Reporting Information [Line Items]
Total revenues	1,680	1,533
Segment Reconciling Items
Segment Reporting Information [Line Items]
Fees attributed to guarantee benefit reserves	788	780
Net gains (losses) on derivatives and investments	3,085	3,362
Net investment income (loss) related to noncontrolling interests	7	1
Consolidated investments	18	(23)
Net investment income on funds withheld assets	$ 270	$ 307