Segment Information - Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ (1,373)	$ (723)	$ (848)
Total expenses	733	536	465
Equity in earnings (losses) of investees	28	(39)	94
Less: Segment provision (benefit) for income taxes	(93)	11	58
Selected components of segment adjusted operating income:
Net investment income	365	269	269
Interest expense	90	81	87
Operating Segments
Segment Reporting Information [Line Items]
Revenues	(931)	(869)	(816)
Total expenses	513	378	141
Equity in earnings (losses) of investees	87	(51)	144
Less: Segment provision (benefit) for income taxes	(119)	33	116
Selected components of segment adjusted operating income:
Net investment income	370	278	280
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(855)	(757)	(733)
Total expenses	435	259	33
Equity in earnings (losses) of investees	82	(51)	144
Less: Segment provision (benefit) for income taxes	(119)	34	122
Segment adjusted operating income (loss)	621	413	722
Selected components of segment adjusted operating income:
Net investment income	370	278	280
Interest expense	0	1	0
Non-cash compensation and operating expenses	38	41	56
Insurance | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	(845)	(748)	(724)
Insurance | Intersegment revenues
Segment Reporting Information [Line Items]
Revenues	10	9	9
Asset Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(76)	(112)	(83)
Total expenses	78	119	108
Equity in earnings (losses) of investees	5	0	0
Less: Segment provision (benefit) for income taxes	0	(1)	(6)
Segment adjusted operating income (loss)	3	(6)	(19)
Selected components of segment adjusted operating income:
Net investment income	0	0	0
Interest expense	1	1	1
Non-cash compensation and operating expenses	8	18	17
Asset Management | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	(49)	(78)	(73)
Asset Management | Intersegment revenues
Segment Reporting Information [Line Items]
Revenues	$ 27	$ 34	$ 10