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Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 2,383		$ 2,383		$ 2,277
Equity in earnings of partnerships and similar investments	27	$ 6	34	$ 45
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,422		1,422		1,392
Equity in earnings of partnerships and similar investments	12	10	13	15
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	870		870		804
Equity in earnings of partnerships and similar investments	13	(5)	14	26
Private debt
Schedule of Investments [Line Items]
Investments accounted for using the equity method	91		91		$ 81
Equity in earnings of partnerships and similar investments	$ 2	$ 1	$ 7	$ 4

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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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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