Segment Information - Additional Information (Details) $ in Millions		3 Months Ended	6 Months Ended
Dec. 31, 2025 segment	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)
Segment Reporting [Line Items]
Number of reportable segments \| segment	2
Revenues		$ 195	$ 281	$ 456	$ 626
Expenses		135	151	362	320
Operating Segments
Segment Reporting [Line Items]
Revenues		214	214	524	459
Expenses		100	114	286	182
Operating Segments \| Asset Management
Segment Reporting [Line Items]
Revenues		0	15	118	21
Expenses		$ 0	$ 9	$ 68	$ 13

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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+ Details

- 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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+ Details