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Investments - Carrying value for limited partnership interests (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 7,971 | $ 8,114
EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 6,743 | 6,868
Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,228 | 1,246
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 6,745 | 6,589
Private equity | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,546 | 5,372
Private equity | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,199 | 1,217
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,048 | 1,042
Real estate | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,019 | 1,013
Real estate | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 29 | 29
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 178 | 483
Other | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 178 | 483
Other | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 0 | $ 0

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