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Income Taxes - Effective Tax Rate Reconciliation and Pretax Income (Loss) and Revenue by Tax Jurisdiction (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pre-tax Income Taxes and Revenue [Line Items]
Expected tax provision (benefit)	$ 14	$ (1)
Tax-exempt interest	(3)	(4)
State taxes	4	3
Foreign taxes	1	2
Stock based compensation	2	0
Total provision (benefit) for income taxes	$ 18	$ 0
Effective tax rate	20.00%	(0.90%)
Pretax income (loss)	$ 93	$ 15
Revenues	300	177
UNITED STATES
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	84	(4)
Revenues	269	134
Bermuda
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	27	20
Revenues	33	30
U.K.
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(14)	1
Revenues	0	13
Other
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(4)	(2)
Revenues	$ (2)	$ 0

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