Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,882		$ 1,882		$ 1,814
Equity in earnings of partnerships and similar investments	14	$ 28	39	$ 85
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,325		1,325		1,320
Equity in earnings of partnerships and similar investments	11	28	5	75
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	519		519		457
Equity in earnings of partnerships and similar investments	1	(1)	31	7
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	$ 2	$ 1	$ 3	$ 3