Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,661		$ 1,661		$ 1,517
Equity in earnings of partnerships and similar investments	37	$ 73	246	$ 222
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,218		1,218		1,130
Equity in earnings of partnerships and similar investments	40	52	209	151
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	413		413		352
Equity in earnings of partnerships and similar investments	(2)	21	36	66
Private debt
Schedule of Investments [Line Items]
Investments accounted for using the equity method	30		30		$ 35
Equity in earnings of partnerships and similar investments	$ (1)	$ 0	$ 1	$ 5