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Investments - Carrying value for limited partnership interests (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 6,367 | $ 4,563
EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,004 | 3,501
Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,363 | 1,062
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,230 | 3,655
Private equity | EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 3,935 | 2,667
Private equity | Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,295 | 988
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 884 | 697
Real estate | EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 816 | 623
Real estate | Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 68 | 74
Other investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 253 | 211
Other investments | EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 253 | 211
Other investments | Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 0 | $ 0

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