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Investments - Carrying value for limited partnership interests (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 6,941 | $ 8,078
EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,276 | 6,264
Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,665 | 1,814
Private equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 5,575 | 6,131
Private equity | EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 4,043 | 4,463
Private equity | Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,532 | 1,668
Other investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 254 | 906
Other investments | EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 251 | 902
Other investments | Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 3 | 4
Real estate |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 1,112 | 1,041
Real estate | EMA limited partnerships |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | 982 | 899
Real estate | Limited partnership interests |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Limited partnership interests | $ 130 | $ 142

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