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Investments (Limited Partnerships and Real Estate Joint Ventures) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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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

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- 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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