Segment Information - Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Revenues	$ (41)	$ (212)	$ (431)	$ (585)
Segment expenses	43	230	351	506
Segment equity in earnings (losses) of investees	(20)	23	(31)	66
Less: Provision (benefit) for income taxes	(27)	(15)	(6)	8
Operating Segments
Segment Reporting Information [Line Items]
Revenues	(168)	(209)	(652)	(611)
Segment expenses	8	7	238	213
Segment equity in earnings (losses) of investees	(11)	33	(46)	100
Less: Provision (benefit) for income taxes	(7)	28	24	69
Insurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(147)	(190)	(564)	(551)
Segment expenses	(16)	(22)	147	131
Segment equity in earnings (losses) of investees	(11)	33	(46)	100
Less: Provision (benefit) for income taxes	(7)	31	24	75
Segment adjusted operating income (loss)	159	214	347	445
Insurance | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	2	3	6	7
Insurance | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	(145)	(187)	(558)	(544)
Asset Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(21)	(19)	(88)	(60)
Segment expenses	24	29	91	82
Segment equity in earnings (losses) of investees	0	0	0	0
Less: Provision (benefit) for income taxes	0	(3)	0	(6)
Segment adjusted operating income (loss)	(3)	(7)	(3)	(16)
Asset Management | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	8	2	29	6
Asset Management | Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Revenues	$ (13)	$ (17)	$ (59)	$ (54)