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Investments - Carrying value for limited partnership interests (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 7,609 | $ 8,078
EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,785 | 6,264
Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,824 | 1,814
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 6,125 | 6,131
Private equity | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 4,417 | 4,463
Private equity | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,708 | 1,668
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,074 | 1,041
Real estate | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 958 | 899
Real estate | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 116 | 142
Other investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 410 | 906
Other investments | EMA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 410 | 902
Other investments | Fair Value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 0 | $ 4

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