Investments - Detail of equity method investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Investments accounted for using the equity method	$ 1,814	$ 1,700
Equity in earnings of partnerships and similar investments	99	267	$ 321
Real estate-related investments
Schedule of Investments [Line Items]
Investments accounted for using the equity method	1,320	1,229
Equity in earnings of partnerships and similar investments	85	233	226
Private equity funds
Schedule of Investments [Line Items]
Investments accounted for using the equity method	457	438
Equity in earnings of partnerships and similar investments	9	32	100
Private debt funds
Schedule of Investments [Line Items]
Investments accounted for using the equity method	37	33
Equity in earnings of partnerships and similar investments	$ 5	$ 2	$ (5)