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Investments (Limited Partnerships and Real Estate Joint Ventures) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	$ 3,648	$ 3,067
Equity Method Investments
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	1,433	1,067
Limited partnership Fair Value Member
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	940	966
Corporate Joint Venture
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	1,205	970
Limited Partnership Cost Method
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	$ 70	$ 64

X

- Definition

The book value of investments in real estate joint ventures including direct and indirect investments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 976
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477332/976-310-50-1

+ Details

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- Details

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X

- Details

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