Investments (Real Estate and Real Estate Joint ventures - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Investments, All Other Investments [Abstract]
Depreciation	$ 28	$ 29	$ 57	$ 59
Real Estate Investment Property, Net	$ 1,100		$ 1,100		$ 1,000