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Investments (Real Estate and Real Estate Joint ventures - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Investments, All Other Investments [Abstract]          
Depreciation $ 30 $ 32 $ 87 $ 91  
Real Estate Investment Property, Net $ 1,100   $ 1,100   $ 1,000