Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,626		$ 1,626		$ 1,517
Equity in earnings of partnerships and similar investments	76	$ 71	209	$ 149
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,193		1,193		1,130
Equity in earnings of partnerships and similar investments	69	45	169	99
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	402		402		352
Equity in earnings of partnerships and similar investments	5	24	38	45
Private debt
Schedule of Investments [Line Items]
Investments accounted for using the equity method	31		31		$ 35
Equity in earnings of partnerships and similar investments	$ 2	$ 2	$ 2	$ 5