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, 2025	Dec. 31, 2024
Real Estate [Line Items]
Real Estate	$ 2,578	$ 2,235
Real estate partnerships	3,483	2,757
Total real estate and real estate partnerships	$ 6,061	$ 4,992
Real estate \| Industry sector
Real Estate [Line Items]
Percentage	100.00%	100.00%
Hotel
Real Estate [Line Items]
Real Estate	$ 134	$ 135
Hotel \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	5.00%	6.00%
Industrial
Real Estate [Line Items]
Real Estate	$ 62	$ 14
Industrial \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	2.00%	1.00%
Land
Real Estate [Line Items]
Real Estate	$ 601	$ 288
Land \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	23.00%	13.00%
Office
Real Estate [Line Items]
Real Estate	$ 152	$ 208
Office \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	6.00%	9.00%
Retail
Real Estate [Line Items]
Real Estate	$ 208	$ 186
Retail \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	8.00%	8.00%
Apartments
Real Estate [Line Items]
Real Estate	$ 46	$ 47
Apartments \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	2.00%	2.00%
Single family residential
Real Estate [Line Items]
Real Estate	$ 1,312	$ 1,342
Single family residential \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	51.00%	60.00%
Other
Real Estate [Line Items]
Real Estate	$ 63	$ 15
Other \| Real estate \| Industry sector
Real Estate [Line Items]
Percentage	2.00%	1.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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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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Amount of real estate investments, 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; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

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