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Variable Interest Entity (Details) - USD ($) $ in Millions	12 Months Ended
Variable Interest Entity (Details) - USD ($) $ in Millions	Dec. 31, 2024	Mar. 31, 2025
Variable Interest Entity [Line Items]
Aggregate consideration paid	$ 105
Surplus notes	58
Surplus notes outstanding		$ 106
Surplus Note
Variable Interest Entity [Line Items]
Debt instrument, principal	49
Debt instrument, accrued interest	$ 9

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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