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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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pre-tax Income Taxes and Revenue [Line Items]
Expected tax provision (benefit)	$ (6)	$ (6)	$ 6	$ 16
Tax-exempt interest	(3)	(4)	(10)	(12)
Noncontrolling interest	1	0	(5)	(2)
Return to provision adjustment	(20)	(4)	(20)	(4)
State taxes	2	(2)	10	5
Foreign taxes	(1)	4	9	6
Taxes on reinsurance	0	(4)	(1)	(1)
Stock based compensation	0	1	4	1
Other	0	0	1	(1)
Total provision (benefit) for income taxes	$ (27)	$ (15)	$ (6)	$ 8
Effective tax rate	123.50%	(313.30%)	(12.10%)	6.00%
Pretax income (loss)	$ (22)	$ 5	$ 49	$ 145
Revenues	41	212	431	585
United States
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	3	(10)	112	92
Revenues	60	181	435	465
Bermuda
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	10	31	27	67
Revenues	4	32	43	90
U.K.
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(30)	(13)	(75)	(9)
Revenues	(21)	(1)	(39)	29
Other
Pre-tax Income Taxes and Revenue [Line Items]
Pretax income (loss)	(5)	(3)	(15)	(5)
Revenues	$ (2)	$ 0	$ (8)	$ 1

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