Segment Information - Segment Revenue by Country of Domicile (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 723	$ 848	$ 1,115
Subtotal
Segment Reporting Information [Line Items]
Revenues	887	960	989
U.S. | Subtotal
Segment Reporting Information [Line Items]
Revenues	727	762	788
Bermuda | Subtotal
Segment Reporting Information [Line Items]
Revenues	129	153	155
U.K. | Subtotal
Segment Reporting Information [Line Items]
Revenues	32	42	38
Other | Subtotal
Segment Reporting Information [Line Items]
Revenues	$ (1)	$ 3	$ 8