Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Unearned premium reserves, net	$ 26	$ 51
Net unrealized investment losses	70	0
Net unrealized investment losses	7	0
Rent	18	17
Foreign tax credit	5	24
Net operating loss	25	28
Depreciation	30	27
Deferred compensation	30	29
Deferred balances related to non-U.S. affiliates	14	0
Other	23	19
Total deferred tax assets	248	195
Deferred tax liabilities:
Net unrealized investment gains	0	74
Investments	0	30
DAC	20	20
Loss and LAE reserve	74	44
Lease	14	16
Other	21	20
Total deferred tax liabilities	129	204
Less: Valuation allowance	5	24	$ 24	$ 36
Net deferred tax assets (liabilities)		$ (33)
Net deferred tax assets (liabilities)	$ 114