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Investments - Unrealized loss and Limited partnerships (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Other details of unrealized loss |  |
Limited partnership interests | $ 8,078 | $ 7,505
EMA limited partnerships |  |
Other details of unrealized loss |  |
Limited partnership interests | 6,260 | 5,730
Limited partnership interests |  |
Other details of unrealized loss |  |
Limited partnership interests | $ 1,810 | $ 1,780

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