Segment Information - Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Revenues	$ 360	$ 90	$ 643	$ 390
Segment expenses	221	112	386	308
Segment equity in earnings (losses) of investees	5	0	7	(11)
Less: Provision (benefit) for income taxes	18	3	41	21
Operating Segments
Segment Reporting Information [Line Items]
Revenues	254	167	485	484
Segment expenses	143	69	264	230
Segment equity in earnings (losses) of investees	5	(34)	35	(35)
Less: Provision (benefit) for income taxes	12	9	36	31
Insurance | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	221	137	409	413
Insurance | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(3)	(2)	(5)	(4)
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	224	139	414	417
Segment expenses	110	41	189	163
Segment equity in earnings (losses) of investees	5	(34)	35	(35)
Less: Provision (benefit) for income taxes	13	9	37	31
Segment adjusted operating income (loss)	106	55	223	188
Asset Management | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	19	16	44	46
Asset Management | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(11)	(12)	(27)	(21)
Asset Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues	30	28	71	67
Segment expenses	33	28	75	67
Segment equity in earnings (losses) of investees	0	0	0	0
Less: Provision (benefit) for income taxes	(1)	0	(1)	0
Segment adjusted operating income (loss)	$ (2)	$ 0	$ (3)	$ 0