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Investments (Limited Partnerships and Real Estate Joint Ventures) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | $ 2,791 | $ 2,635
Equity Method Investments |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 956 | 925
Limited partnership Fair Value Member |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 911 | 856
Corporate Joint Venture |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 869 | 783
Limited Partnership Cost Method |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | $ 55 | $ 71

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