Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,848		$ 1,814
Equity in earnings of partnerships and similar investments	25	$ 57
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,309		1,320
Equity in earnings of partnerships and similar investments	(6)	47
Private equity
Schedule of Investments [Line Items]
Investments accounted for using the equity method	500		457
Equity in earnings of partnerships and similar investments	30	8
Private debt
Schedule of Investments [Line Items]
Investments accounted for using the equity method	39		$ 37
Equity in earnings of partnerships and similar investments	$ 1	$ 2