Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,756		$ 1,756		$ 1,700
Equity in earnings of partnerships and similar investments	28	$ 76	85	$ 209
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,313		1,313		1,229
Equity in earnings of partnerships and similar investments			75	169
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	408		408		438
Equity in earnings of partnerships and similar investments			7	38
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			$ 3	$ 2