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Segment Information - Segment Revenue by Country of Domicile (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 872	$ 1,373	$ 723
Subtotal
Segment Reporting Information [Line Items]
Revenues	886	1,267	887
U.S. | Subtotal
Segment Reporting Information [Line Items]
Revenues	685	1,064	727
Bermuda | Subtotal
Segment Reporting Information [Line Items]
Revenues	168	166	129
U.K. | Subtotal
Segment Reporting Information [Line Items]
Revenues	32	36	32
Other | Subtotal
Segment Reporting Information [Line Items]
Revenues	$ 1	$ 1	$ (1)

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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