Segment Information - Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Revenues	$ 403	$ 41	$ 1,046	$ 431
Segment expenses	219	43	605	351
Segment equity in earnings (losses) of investees	18	(20)	25	(31)
Less: Provision (benefit) for income taxes	43	(27)	84	(6)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	208	168	693	652
Segment expenses	165	8	429	238
Segment equity in earnings (losses) of investees	25	(11)	60	(46)
Less: Provision (benefit) for income taxes	9	(7)	45	24
Insurance | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	206	145	615	558
Insurance | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(2)	(2)	(7)	(6)
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	208	147	622	564
Segment expenses	165	(16)	354	147
Segment equity in earnings (losses) of investees	25	(11)	60	(46)
Less: Provision (benefit) for income taxes	9	(7)	46	24
Segment adjusted operating income (loss)	59	159	282	347
Asset Management | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	0	13	44	59
Asset Management | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0	(8)	(27)	(29)
Asset Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues	0	21	71	88
Segment expenses	0	24	75	91
Segment equity in earnings (losses) of investees	0	0	0	0
Less: Provision (benefit) for income taxes	0	0	(1)	0
Segment adjusted operating income (loss)	$ 0	$ (3)	$ (3)	$ (3)