Segment Information - Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 872	$ 1,373	$ 723
Loss and LAE (benefit)	(26)	162	16
Employee compensation and benefit expenses	202	251	258
Amortization of DAC	20	13	14
Total expenses	446	733	536
Segment equity in earnings (losses) of investees	62	28	(39)
Less: Segment provision (benefit) for income taxes	96	(93)	11
Selected components of segment adjusted operating income:
Net investment income	340	365	269
Interest expense	91	90	81
Intersegment revenues
Segment Reporting Information [Line Items]
Total revenues	38
Total expenses	(17)
Segment equity in earnings (losses) of investees	(47)
Less: Segment provision (benefit) for income taxes	(2)
Operating segments
Segment Reporting Information [Line Items]
Total revenues	831	931	869
Loss and LAE (benefit)	(18)	161	12
Amortization of DAC	20	13	14
Total expenses	295	513	378
Segment equity in earnings (losses) of investees	104	87	(51)
Less: Segment provision (benefit) for income taxes	110	(119)	33
Selected components of segment adjusted operating income:
Net investment income	339	370	278
Corporate division
Segment Reporting Information [Line Items]
Total revenues	17	275	4
Loss and LAE (benefit)	0	0	0
Amortization of DAC	0	0	0
Total expenses	169	216	143
Segment equity in earnings (losses) of investees	5	0	0
Less: Segment provision (benefit) for income taxes	(12)	14	(5)
Selected components of segment adjusted operating income:
Net investment income	14	8	4
Insurance | Third-party revenues
Segment Reporting Information [Line Items]
Total revenues	811	845	748
Insurance | Intersegment revenues
Segment Reporting Information [Line Items]
Total revenues	10	10	9
Insurance | Operating segments
Segment Reporting Information [Line Items]
Total revenues	821	855	757
Loss and LAE (benefit)	(18)	161	12
Employee compensation and benefit expenses	170	154	148
Amortization of DAC	20	13	14
Other segment items	117	107	85
Total expenses	289	435	259
Segment equity in earnings (losses) of investees	102	82	(51)
Less: Segment provision (benefit) for income taxes	109	(119)	34
Segment adjusted operating income (loss)	525	621	413
Selected components of segment adjusted operating income:
Net investment income	339	370	278
Non-cash compensation and operating expenses	60	38	41
Asset Management | Third-party revenues
Segment Reporting Information [Line Items]
Total revenues	8	49	78
Asset Management | Intersegment revenues
Segment Reporting Information [Line Items]
Total revenues	2	27	34
Asset Management | Operating segments
Segment Reporting Information [Line Items]
Total revenues	10	76	112
Loss and LAE (benefit)	0	0	0
Employee compensation and benefit expenses	0	59	80
Amortization of DAC	0	0	0
Other segment items	6	19	39
Total expenses	6	78	119
Segment equity in earnings (losses) of investees	2	5	0
Less: Segment provision (benefit) for income taxes	1	0	(1)
Segment adjusted operating income (loss)	5	3	(6)
Selected components of segment adjusted operating income:
Net investment income	0	0	0
Non-cash compensation and operating expenses	$ 0	8	$ 18
Corporate Segment | Operating segments
Segment Reporting Information [Line Items]
Total revenues		275
Employee compensation and benefit expenses		38
Other segment items		79
Selected components of segment adjusted operating income:
Interest expense		$ 99