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Investments - Detail of equity method investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Schedule of Investments [Line Items]      
Investments accounted for using the equity method $ 1,619   $ 1,517
Equity in earnings of partnerships and similar investments 133 $ 78  
Real estate-related investments      
Schedule of Investments [Line Items]      
Investments accounted for using the equity method 1,195   1,130
Equity in earnings of partnerships and similar investments 100 54  
Private equity      
Schedule of Investments [Line Items]      
Investments accounted for using the equity method 391   352
Equity in earnings of partnerships and similar investments 33 21  
Private debt      
Schedule of Investments [Line Items]      
Investments accounted for using the equity method 33   $ 35
Equity in earnings of partnerships and similar investments $ 0 $ 3