Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,911		$ 1,911		$ 1,814
Equity in earnings of partnerships and similar investments	6	$ 17	45	$ 102
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,349		1,349		1,320
Equity in earnings of partnerships and similar investments	10	11	15	86
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	524		524		457
Equity in earnings of partnerships and similar investments	(5)	5	26	12
Private debt
Schedule of Investments [Line Items]
Investments accounted for using the equity method	38		38		$ 37
Equity in earnings of partnerships and similar investments	$ 1	$ 1	$ 4	$ 4