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Investments, Debt and Equity Securities (Limited Partnerships and Real Estate Joint Ventures) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | $ 2,327 | $ 1,996
Equity Method Investments |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 934 | 780
Limited partnership Fair Value Member |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 683 | 581
Cost-method Investments |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | 49 | 63
Corporate Joint Venture |  |
Real Estate [Line Items] |  |
Real Estate Investments, Joint Ventures | $ 661 | $ 572

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- Definition The book value of investments in real estate joint ventures including direct and indirect investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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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 No definition available. + Details
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