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Investments (Limited Partnerships and Real Estate Joint Ventures) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | $ 2,473 | $ 2,327
Equity Method Investments |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 928 | 934
Limited partnership Fair Value Member |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 768 | 683
Corporate Joint Venture |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 715 | 661
Limited Partnership Cost Method |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | $ 62 | $ 49

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