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Investments - Carrying value for limited partnership interests (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 7,943 | $ 8,018
EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 6,548 | 6,487
Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,395 | 1,531
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 6,578 | 6,339
Private equity | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,224 | 4,905
Private equity | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,354 | 1,434
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 928 | 920
Real estate | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 887 | 823
Real estate | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 41 | 97
Other |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 437 | 759
Other | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 437 | 759
Other | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 0 | $ 0

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