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Real Estate and Real Estate Partnerships - Schedule of Carrying Amount of Investment Real Estate, Net (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Real Estate [Line Items]
Real Estate	$ 2,008	$ 755
Real estate partnerships	4,466	2,856
Total real estate and real estate partnerships	$ 6,474	$ 3,611
Real estate | Industry sector
Real Estate [Line Items]
Percentage	100.00%	100.00%
Hotel
Real Estate [Line Items]
Real Estate	$ 124	$ 14
Hotel | Real estate | Industry sector
Real Estate [Line Items]
Percentage	6.00%	2.00%
Industrial
Real Estate [Line Items]
Real Estate	$ 20	$ 65
Industrial | Real estate | Industry sector
Real Estate [Line Items]
Percentage	1.00%	9.00%
Land
Real Estate [Line Items]
Real Estate	$ 127	$ 37
Land | Real estate | Industry sector
Real Estate [Line Items]
Percentage	6.00%	5.00%
Office
Real Estate [Line Items]
Real Estate	$ 177	$ 358
Office | Real estate | Industry sector
Real Estate [Line Items]
Percentage	9.00%	47.00%
Retail
Real Estate [Line Items]
Real Estate	$ 216	$ 218
Retail | Real estate | Industry sector
Real Estate [Line Items]
Percentage	11.00%	29.00%
Apartment
Real Estate [Line Items]
Real Estate	$ 47	$ 60
Apartment | Real estate | Industry sector
Real Estate [Line Items]
Percentage	2.00%	8.00%
Single family residential
Real Estate [Line Items]
Real Estate	$ 1,282	$ 0
Single family residential | Real estate | Industry sector
Real Estate [Line Items]
Percentage	64.00%	0.00%
Other
Real Estate [Line Items]
Real Estate	$ 15	$ 3
Other | Real estate | Industry sector
Real Estate [Line Items]
Percentage	1.00%	0.00%

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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