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Investments - Schedule of Carrying Value for Limited Partnership Interests (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 8,562 | $ 8,380
EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 7,416 | 7,215
Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,146 | 1,165
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 7,266 | 7,154
Private equity | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 6,144 | 6,015
Private equity | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,122 | 1,139
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,138 | 1,085
Real estate | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,114 | 1,059
Real estate | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 24 | 26
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 158 | 141
Other | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 158 | 141
Other | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 0 | $ 0

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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