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Investments (Limited Partnerships and Real Estate Joint Ventures) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	$ 2,560	$ 2,327
Equity Method Investments
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	930	934
Limited partnership Fair Value Member
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	818	683
Corporate Joint Venture
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	744	661
Limited Partnership Cost Method
Real Estate [Line Items]
Real Estate Investments, Joint Ventures	$ 68	$ 49

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//1943274/2147479440/944-210-S99-1

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- 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//1943274/2147482856/976-310-50-1

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