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Investments in Operating Joint Ventures (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]        
Investment in operating joint ventures $ 1,192   $ 1,211 $ 1,306
Prismic HoldCo        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   20.00%    
Asset management fee income        
Schedule of Equity Method Investments [Line Items]        
Investment in operating joint ventures $ 10   $ 1 $ 11