Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets, less accumulated amortization	$ 307	$ 326
Finite-Lived Intangible Assets, Net	292	312
2018	30
2019	28
2020	26
2021	24
2022	22
Thereafter	162
Amortization of intangible assets	29	47	$ 55
Goodwill	70	61	46
Goodwill, Acquired During Period	9	15
Goodwill, Impaired, Accumulated Impairment Loss	0	0
License
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	14	14
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	57	52
Finite-Lived Intangible Assets, Accumulated Amortization	10	6
Intangible assets, less accumulated amortization	47	47
2018	5
2019	4
2020	4
2021	4
2022	4
Thereafter	$ 26
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 3 months 18 days
Amortization of intangible assets	$ 4	3	3
Insurance Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	1,258	1,247
Finite-Lived Intangible Assets, Accumulated Amortization	1,013	981
Intangible assets, less accumulated amortization	245	266
2018	26
2019	24
2020	22
2021	20
2022	18
Thereafter	$ 136
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years 1 month 6 days
Amortization of intangible assets	$ 25	$ 44	$ 52