Segment Information - Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information [Line Items]
Revenues	$ 245	$ 283
Segment expenses	125	165
Segment equity in earnings (losses) of investees	24	2
Less: Provision (benefit) for income taxes	31	23
Operating Segments
Segment Reporting Information [Line Items]
Revenues	230	231
Segment expenses	85	121
Segment equity in earnings (losses) of investees	41	30
Less: Provision (benefit) for income taxes	36	24
Insurance | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	227	188
Insurance | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(2)	(2)
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	229	190
Segment expenses	85	79
Segment equity in earnings (losses) of investees	40	30
Less: Provision (benefit) for income taxes	35	24
Segment adjusted operating income (loss)	149	117
Asset Management | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	1	25
Asset Management | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0	(16)
Asset Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1	41
Segment expenses	0	42
Segment equity in earnings (losses) of investees	1	0
Less: Provision (benefit) for income taxes	1	0
Segment adjusted operating income (loss)	$ 1	$ (1)