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Investments - Schedule of Carrying Value for Limited Partnership Interests (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 8,363 | $ 8,114
EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 7,169 | 6,868
Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,194 | 1,246
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 7,092 | 6,589
Private equity | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,925 | 5,372
Private equity | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,167 | 1,217
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,103 | 1,042
Real estate | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,076 | 1,013
Real estate | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 27 | 29
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 168 | 483
Other | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 168 | 483
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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