Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,807		$ 1,807		$ 1,700
Equity in earnings of partnerships and similar investments	17	$ 37	102	$ 246
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,321		1,321		1,229
Equity in earnings of partnerships and similar investments	11	40	86	209
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	451		451		438
Equity in earnings of partnerships and similar investments	5	(2)	12	36
Private debt
Schedule of Investments [Line Items]
Investments accounted for using the equity method	35		35		$ 33
Equity in earnings of partnerships and similar investments	$ 1	$ (1)	$ 4	$ 1